mikaela.github.io/pages/matrix.markdown

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layout: page
title: "[m]"
navigation: true
permalink: /matrix/
excerpt: "Matrix, a decentralised conversation store"
redirect_from:
  - /matrix.html
---

Just like [IRC](/irc/), _Matrix_ has became a part of my social life online. My
room can be found from [my discuss page](/discuss) alongside
some protocol comparison and my main accounts are in [index](/).

I also have a [txt with a list of all my accounts](/txt/matrix.txt) which [has SSH signature](/txt/matrix.txt.sig).

---

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- [Matrix-related posts](#matrix-related-posts)
- [Questions & Answers](#questions--answers)
  - [Where else can I read about Matrix?](#where-else-can-i-read-about-matrix)
  - [How do you do custom not-emoji reactions?](#how-do-you-do-custom-not-emoji-reactions)
  - [What are ghost and puppets?](#what-are-ghost-and-puppets)
  - [What does the public history visibility mean? I don't want to appear in search engines](#what-does-the-public-history-visibility-mean-i-dont-want-to-appear-in-search-engines)
  - [Can I see who is in any specific room without being there?](#can-i-see-who-is-in-any-specific-room-without-being-there)
  - [What are state resets?](#what-are-state-resets)
    - [How about DAG splits?](#how-about-dag-splits)
  - [Can I have a non-federated room?](#can-i-have-a-non-federated-room)
  - [What exactly is room upgrading?](#what-exactly-is-room-upgrading)
  - [What are these idlekicks for inactivity, why are they for?](#what-are-these-idlekicks-for-inactivity-why-are-they-for)
    - [But the relaybots look so ugly](#but-the-relaybots-look-so-ugly)
  - [I am told that I should Matrixify my IRC channel, what does that mean?](#i-am-told-that-i-should-matrixify-my-irc-channel-what-does-that-mean)
  - [Why should I use Matrix instead of IRC?](#why-should-i-use-matrix-instead-of-irc)
    - [Why isn't Pirate Party of Finland using Matrix?](#why-isnt-pirate-party-of-finland-using-matrix)
  - [I don't currently want to touch Matrix, but I am seeing abuse from there, what can I do?](#i-dont-currently-want-to-touch-matrix-but-i-am-seeing-abuse-from-there-what-can-i-do)
    - [I fear someone has said yes](#i-fear-someone-has-said-yes)
      - [That doesn't help me](#that-doesnt-help-me)
  - [Personal questions](#personal-questions)
    - [Why so many accounts?](#why-so-many-accounts)
      - [Brief history of my experiences with dead homeservers](#brief-history-of-my-experiences-with-dead-homeservers)
    - [Why do you use Matrix URI scheme instead of matrix.to?](#why-do-you-use-matrix-uri-scheme-instead-of-matrixto)
    - [Why does one of your accounts have capital letter in the username?](#why-does-one-of-your-accounts-have-capital-letter-in-the-username)
    - [Which client do you recommend?](#which-client-do-you-recommend)
    - [Which homeserver do you recommend?](#which-homeserver-do-you-recommend)
    - [Why don't you run your own?](#why-dont-you-run-your-own)
    - [Why cannot I see history in your Matrix rooms?](#why-cannot-i-see-history-in-your-matrix-rooms)
    - [So do you wish Matrix to fail?](#so-do-you-wish-matrix-to-fail)

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---

## Matrix-related posts

_Note that this section is manually updated and might be missing some
links._

- Critique
  - [Inconsistency issues of Element, Element and Element, also privacy concerns]({% post_url blog/2021-08-03-matrix-perfect-privacy-not %})
  - [Without selfhosting a homeserver or even then, Matrix moderation tools rely on security through obscurity]({% post_url blog/2021-12-05-matrix-community-abuse-security-by-obscurity %})
- [A couple of words on protocols (on the Discuss page)](/discuss.html#a-couple-of-words-on-protocols)

## Questions & Answers

### Where else can I read about Matrix?

- [Miki is the Matrix wiki](https://en.miki.community/) where I will attempt to contribute to.
- [Matrix.org](https://matrix.org/) is the official website.
- [My gist repository also has notes on Matrix, mostly /devtools related ones](https://gitea.blesmrt.net/mikaela/gist/src/branch/master/matrix), they predate Miki and I hope to sort more relevant or historical parts there.
- This site has random assortment of Matrix details around.
  - [txt/matrix.txt](/txt/matrix.txt)
  - [n/matrixspoilers](/n/matrixspoilers.html) has a quick note on spoilers.
- [apothecary.gay has a Matrix Tips & Tricks page](https://apothecary.gay/rules/matrix-tricks/)
  - At the time of writing also on using spoilers and custom emotes/stickers.
- Cos has written [Matrix tips they don't tell you](https://wordsmith.social/cos/matrix-tips-they-dont-tell-you) containing a FAQ, hints and guides.

### How do you do custom not-emoji reactions?

They are implemented by multiple clients other than Element. In FluffyChat, Gomuks and Nheko you can reply to something with `/react something` to add a `something` reaction. In Hydrogen there is a `...` next to emojis allowing you to enter freeform text as a reaction. In Schildichat Android when you search for a reaction, it offers to send your search as a freeform-reaction.

[Element-Web doesn't support this yet](https://github.com/vector-im/element-web/issues/19409) and while there is [open pull request](https://github.com/matrix-org/matrix-react-sdk/pull/6628), the merging is blocked due to Element not knowing how to handle moderation and reporting for malicious reactions.

### What are ghost and puppets?

They are related to bringing Matrix to other protocols or vice versa.

- A ghost is a Matrix account on another protocol like IRC or XMPP (controlled from Matrix).
- A puppet is the opposite, a Matrix account controlled from another protocol such as IRC or XMPP (the controller/puppetmaster being the user there).
- A double-puppet is when you are using both protocols and have connected them to each other such as a message from Discord appears as your real Matrix account and message from Matrixx appears as your real Discord account instead of something virtual only existing due to the bridge.

### What does the public history visibility mean? I don't want to appear in search engines

The public/world-readable history visibility option means exactly what it says,
public even without joining the room. These rooms are accessible to tools
such as [Matrix Static](https://view.matrix.org/) or upcoming [Matrix Public Archive](https://github.com/matrix-org/matrix-public-archive)
and thus their history is visible in search engines. If this isn't what you
want, set history visibility to one of the members only options (since
selecting this option, since being invited or since join).

Note that as the option name hints, the history visibility option will not
apply to previous messages. Thus if you first make room public and then
restrict it to members only the messages between these two changes are public
and new users will see them. Same if messages are visible to members and
then restricted further.

Another thing worth noting here is that encryption will not prevent new users
from reading the future messages, Matrix will share keys to new joiners to
some extent. For more information refer to [Matrix Spec issue #1](https://github.com/matrix-org/matrix-spec/issues/1)
and related issues.

### Can I see who is in any specific room without being there?

In general no, although there is a cornercase that by poking room directory API e.g. for [#matrix.fi:matrix.org](matrix:r/matrix.fi:matrix.org): [https://matrix-client.matrix.org/\_matrix/client/v3/directory/room/%23matrix.fi%3Amatrix.org](https://matrix-client.matrix.org/_matrix/client/v3/directory/room/%23matrix.fi%3Amatrix.org), you get the room ID and list of homeservers in it and if you see a single user (or otherwise not so popular homeserver), you can make educated guesses on who may be in the room.

I think this requires for the room to have an alias (not-published one should be fine) and a homeserver aware of the alias and room being queried.

### What are state resets?

The term is used least in two different scenarios:

- when your display name and/or avatar return back to what they were previously
  without anyone doing anything.
- more seriously when the Matrix federation decides that the room is actually
  in the past adding/removing users who were (or weren't) in the room at that time.
  This also affects administrator/moderator access.

[This issue was supposed to be fixed at room version 2 with Stare Resolution Version 2](https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions),
but regardless [still happens in all versions after that](https://github.com/matrix-org/synapse/issues/8629). If you are affected, your best bet is to
`/upgraderoom {{site.matrixLatestRoomVersion}}`, which is a bit distruptive operation as all your users have to join the upgraded version and all homeservers involved must support it.

You shouldn't just trust me or the variable on this site on what is the latest version, [consult the Spec](https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions) and add [Version Checker](matrix:u/version:maunium.net) or [Fluff Generator](matrix:u/+:jae.fi) or [their sibling](https://github.com/maubot/rsvc) to your room and once they join, `!servers upgrade {{site.matrixLatestRoomVersion}}` replacing the {{site.matrixLatestRoomVersion}} with your target version.

#### How about DAG splits?

DAG splits are a phenomenon somehow related to state resets above, but instead
of all servers accepting the same old state, they disagree and split to different
directions with varying severity.

In minor case some servers may decide that a user is not in the room and not
display messages from them, while in more severe situations the room may practically
be two different rooms with no new messages in common between different sides
kind of resembling [IRC's netsplits before sync.](https://en.wikipedia.org/wiki/Netsplit)

People understanding state resolution (which by the way don't include me)
disagree on the exact cause only agreeing that it's difficult to fix. From
what is told to me, I understand it to be tracked [in the same Synapse issue #8629](https://github.com/matrix-org/synapse/issues/8629).

### Can I have a non-federated room?

Yes, there are two methods.

1. During room creation, Element Web offers an option to have a non-federated
   room. That will permanently prevent any other homeserver from joining and
   to change that a manual room upgrade is required.
1. What I recommend instead is setting a server ACL, so if necessary it can be
   changed later. This may be helpful when migrating to another domain (which
   Matrix doesn't support) or cooperation with another entity with their own
   homeserver or anything.

The second method begins with the usual `/devtools`, explore room state, `Send
custom state event`, enter type as `m.room.server_acl` and contents:

```json
{
  "allow": ["example.org"],
  "allow_ip_literals": false,
  "deny": []
}
```

Now assuming all homeservers in the room implement ACL, only `example.org`
users can join the room.

For futher reading about ACL:

- [matrix.org: Moderation in Matrix, Banning servers from rooms (Server ACLs)](https://matrix.org/docs/guides/moderation#banning-servers-from-rooms-server-acls)
  - [[TODO: release our server-ACL enforcing scripts]](https://github.com/matrix-org/matrix.org/issues/557)
- [Matrix Specification on ACL](https://spec.matrix.org/latest/client-server-api/#server-access-control-lists-acls-for-rooms)
- [matrix-org/matrix-spec#928: Consider handling server ACLs through event auth rules rather than at the network level #928](https://github.com/matrix-org/matrix-spec/issues/928)

### What exactly is room upgrading?

Room upgrading basically means:

1. Create a new room.
1. Send an event to old room saying "the room has now moved to new room"
1. Unless upgraded manually, the client copies some state such as power
   levels from the old room to the new one.

Manual upgrading means poking the API endpoint manually and thus not copying
creation event (non-federation state) or power levels. For an example see my
[matrix-tombstone-room.bash script](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash/matrix-tombstone-room.bash)

See also [Matrix Specification on room versions](https://spec.matrix.org/latest/rooms/)
or `CTRL-F` this page for `/upgraderoom {{site.matrixLatestRoomVersion}}`
(Element Web command to perform the upgrade).

### What are these idlekicks for inactivity, why are they for?

Some Matrix rooms decide to connect their channel to IRC maintaining the same users on both sides, which can be heavy for the IRC network depending on bridge type of which there are three "major" variants:

- matrix-appservice-irc which creates a ghost for every Matrix user on the IRC side. All of these pretend to be separate clients, so if you have 1000 ghosts at IRC, all internal PING/PONG (keepalive) traffic will be sent 1000 times every few minutes and so will every message received.
- heisenbridge has two modes, either it acts as a IRC bouncer keeping everything separate for every user or a single bot connection to IRC while creating puppets for IRC users to use at Matrix. It also supports RELAYMSG for more modern IRC networks.
- matterbridge is the most lightweight of the three working as a traditional relaybot on both sides. Unlike the others, it doesn't require selfhosting your own homeserver making it the most accessible for those with less resources and the option I use whenever possible. Sadly it doesn't look that great [without RELAYMSG support I live in hope of Matrix implementing one day](https://github.com/matrix-org/matrix-spec/issues/840).

As matrix-appservice-irc very quickly becomes traffic-intensive, its operators generally have agreement with IRC networks (or are IRC networks by themselves) to remove unused connections after a month or three of inactivity, which is judged by lack of public read-receipts anywhere the bridge can see. It could have been implemented better [pretending to be a server instead](https://github.com/matrix-org/matrix-appservice-irc/issues/329), which would have a problem of practically being `root` and thus not many IRC networks would open their door to a third party bridge and the Ergo IRCd doesn't even support server linking (opting to be HA instead, but more of that in "Why should I use Matrix instead of IRC?").

Being a server would also resolve IRC users getting annoyed by huge disconnection floods whenever matrix-appservice-irc restarts as it could be [batched by the IRCd users are connected to](https://ircv3.net/specs/batches/netsplit).

The issues of matrix-appservice-irc grow worse when the room has bridges to other protocols, as those grow the IRC user count, use nicknames (sometimes capturing nicknames of people using both protocols and may be difficult to regain if the bridge doesn't answer to `!irc nick SomethingElse`) especially when the other protocol doesn't support direct/private messages and doesn't have even that excuse of using a connection slot.

I hope this answer helped explain why this behaviour exists and that IRC users aren't opposed to bridging out of malice.

#### But the relaybots look so ugly

IRC users have dealt with them since always, I tend to use Limnoria IRC bot which is forked from Supybot and has had the Relay plugin (for relaying messages between multiple IRC networks) [since possibly before `Wed Feb 2 06:45:35 2005 +0000`](https://github.com/progval/Limnoria/commit/e4e5c1482489451c1ae9b6b4ee9b9147a295320e) and I imagine it was far from the first IRC relay.

This means that even before IRCv3 RELAYMSG and displayname proposals, which I wish to merge so modern clients could show displaynames and legacy RELAYMSGs, there have been client-side solutions that have also been evolving:

- Irssi I haven't used personally, but I hear it has a [detelexify](https://github.com/zouppen/irssi-detelexify/) that looks a bit like it's made with Heisenbridge in mind.
- WeeChat used to have a separate script for this, but at version 1.1 in gained the Trigger plugin able to perform actions without scripts, thus meaning you can use something like [this Relaybot 2 Trigger example](https://github.com/weechat/weechat/wiki/Triggers#relaybot-2) without having to install anything (while `/script` would be easy too).

I hope Matrix will get better at this too.

### I am told that I should Matrixify my IRC channel, what does that mean?

You are likely using IRCnet and I am sorry that you have to deal with this raider group. It means some mix of:

- setting a Matrix avatar to the room
- removing the `#` from the name of the Matrix room
- setting a main alias to the Matrix room that doesn't contain the IRC network's name
- bridging to Matrix in a way that Matrix user (that may not be you) has full power over the room, potentially also over the bridge bot
  - be careful if you are told to answer a bot `yes` in a `/query`!

### Why should I use Matrix instead of IRC?

No reason, if IRC suits you better than Matrix. As I have said before, I find
maintaining IRC easier. IRC also tends to work better for me in poor network conditions
and with [IRCv3](https://ircv3.net/) specifications and implemented draft proposals,
it can be very pleasant modern experience without the issues that come from federation.

There is a usecase for every tool and while federation is important feature
in general I am yet to miss it in IRC.

I keep mentioning Ergo IRCd, which [scales](https://github.com/ergochat/ergo/blob/master/docs/MANUAL.md#scalability), has serverside history and integrated bouncer
feature so it's just a matter of adding it to your IRC client alongside your
SASL credentials and you will receive your offline messages whenever you
reconnect. Ergo also supports `RELAYMSG` making messages from other protocols
seem more native to read and many graphical IRC clients even provide integrated
image uploading support.

[Pirate Party of Finland](https://piraattipuolue.fi/en) considers Ergo-based [PirateIRC](https://pirateirc.net/)
and [its webchat](https://webchat.pirateirc.net/) a reasonable fallback should we have to leave other protocols
or they would be unusable otherwise.

#### Why isn't Pirate Party of Finland using Matrix?

This goes a bit past my personal Q&A, but we are using it kind of as a "tech demo".
However it cannot currently mature past that as:

- we don't have people interested in Matrix (obviously excluding me).
- we don't have resources for hosting a Matrix homeserver, while we had IRC before we were founded.
- moderation tools are so bad it's only me dealing with them (see critiques near top of the page).
- [Matrix flagship clients, Element Web, Element Android and Element iOS don't support knocking](https://github.com/vector-im/element-meta/issues/43)
  which has been supported by Matrix Specification since September 2021 or so meaning
  users of those aren't able to request access to our rooms, unless they
  are members of an allowed rooms first.

If you want in, your options are:

- Join [Matrix Suomi Space](matrix:r/matrix-suomi:kapsi.fi), which lists
  Finnish speaking rooms and then [our space](matrix:r/space.piraatit.fi:matrix.org).
  - Due to aforementioned lack of moderation tools, this can be withdrawn should that become necessary to mitigate abuse.
- Knock one of our rooms using Nheko and [hope someone is watching from Nheko](https://github.com/Nheko-Reborn/nheko/issues/1226).
- Come to [#verkkopalvelut using PrateIRC webchat](https://webchat.pirateirc.net/?channel=#verkkopalvelut)
  and tell `AmindaSuomalainen` your Matrix ID in a nice message (to show you aren't a bot) that you wish in.

### I don't currently want to touch Matrix, but I am seeing abuse from there, what can I do?

If you are using Telegram or Discord, you are out of luck, as while you can
remove messages, that may get removed from Matrix, you cannot remove the
abusive users. If you are using XMPP you may be out of luck.

However if you use IRC and the Matrix users are behind matrix-appservice-irc
([check this list](https://github.com/matrix-org/matrix-appservice-irc/blob/develop/docs/bridged_networks.md) or your network operators) you may be in luck as long as
[you or your ops haven't answered "yes" to the Matrix bot](https://github.com/matrix-org/matrix-appservice-irc/issues/462).

Matrix-appservice-irc attempts to sync permissions from IRC in a limited fashion,
and if it's unable to join a ghost (see an earlier question), it will kick the
user from Matrix for as long as the ban stays in place.

In other words, if you were using Matrix personally, the IRC bridge would
drastically increase the moderation tools available for you! You can now use
wildcard bans that aren't natively supported and even extbans like (LiberaChat's)
`/mode #yourchannel +b $r:*:matrix.org*` to ban all matrix.org users from your
channel or set `+e` ban exceptions on them!

_Note: this obviously stops working should the Matrix user change their
gecos/"real name" in which case your only option is to ban the entirety of
Matrix. E.g. on LiberaChat `/mode +b _!_@2001:470:69fc:105::/64` assuming
your abusers don't have a cloak (vhost in any other IRC network)._

#### I fear someone has said yes

In that case someone may have near absolute power on the Matrix side and could have
removed the matrix-appservice-irc bot from power thus preventing it from
kicking users banned from IRC letting them spam freely on Matrix while being
invisible to IRC. In even worse scenario the abusive user was given power
and they are immune to whatever is done from IRC.

There is also the chance that [a netsplit gives a Matrix user moderator permissions that are never removed when sync occurs](https://github.com/matrix-org/matrix-appservice-irc/issues/518).

##### That doesn't help me

If everything else fails, you can always mail abuse at matrix dot org, who
will want the following details (as of 2022-10-16):

- Your matrix ID
- the room ID(s) your report is about
- timestamps or links to the events you are telling us about

Assuming you are an IRC user and thus unable to provide the two first,
I would include:

- IRC network in question
- IRC channel in question
- WHOIS information of the abusive user (the realname should include MXID)
- timestamps and logs upon the incident

I haven't tried this personally though, as I am Matrix user and have been
sending raw events in JSON to them.

### Personal questions

#### Why so many accounts?

My reasons for that are many and I am often proved correct in them.

- By having multiple accounts on different homeservers, there is no single
  entity that can decide whether I participate on Matrix or not. This is also
  a benefit of decentralisation in general.
- In case of federation meltdown, I have multiple entrypoints to send events
  and thus hopefully one of them goes through faster. There have been
  multiple incidents where this could have been useful for room
  administrators.
  - Matrix homeservers used to allow open registration with no kind of
    protection and no warnings they are being ran with that configuration
    until some time before room version 10 was released. This
    allowed multiple rooms to be spammed trivially and it took days for all
    homeservers to sync ACL bans in the worst cases. It also resulted to a lot
    of state resetting so the affected rooms never got cleaned up as the spam
    users kept coming back and clients had issues handling so inflated rooms.
- State resets keep happening and thus I cannot trust other accounts than the
  one which created a room in question stay as power level 100.
- Homeservers come and go, sometimes with little to no warning. As I have many
  functioning accounts generally with power levels set, homeserver migrations
  take me less effort than going through every room and ensuring just now
  created account has power.

##### Brief history of my experiences with dead homeservers

Believe my concern on homeservers coming and going or not, no one is safe.

1. 2018-09-07: [Disroot.org announced Matrix closure](https://disroot.org/en/blog/matrix-closure).
1. 2019-04-12: [Matrix.org was compromised](https://matrix.org/blog/2019/04/11/we-have-discovered-and-addressed-a-security-breach-updated-2019-04-12)
   resulting the homeserver being down for a while, some integrations even
   longer and the XMPP bridge returned months later.
1. From Disroot I moved to Feneas thinking that homeserver being a paid
   membership benefit would help it to stay up and be reliable. However in
   late 2021 and early 2022 we decided to disband the association due to
   COVID-19 pandemic, lack of volunteers, lack of money (which wasn't helped
   by [Finnish money gathering law issues](https://github.com/liberapay/liberapay.org/issues/30)
   etc.
1. Around 2023-04-24 the-apothecary.club went down and writing this on
   2023-04-30 I am yet to hear anything about the downtime. Was it by intent,
   will it return, anything? However I haven't been participating their
   community in a long time and I was only using the account for testing
   purposes so the information not reaching me is understandable, especially
   considering their homeserver main room is not federated.

#### Why do you use Matrix URI scheme instead of matrix.to?

I dislike matrix.to as a concept. It's a centralized service on decentralized protocol and in my opinion it shows lack of self-esteem on Matrix side considering neither XMPP or IRC require something like it, both of those trust being known or handled appropiately.

#### Why does one of your accounts have capital letter in the username?

In 2016 or so I mistakenly thought that usernames would be case-insensitive
and they only [got banned in Synapse on 10th November 2017](https://github.com/matrix-org/synapse/pull/2662).

#### Which client do you recommend?

The one that fits your needs. Personally I mix-and-match:

- FluffyChat on mobile
  - I am a Finnish translator and moderator. It does multiple accounts.
- hydrogen.element.io PWA mainly on mobile, sometimes on desktop
  - It's the only Matrix client that is yet to log me out randomly, very stable, multiple account support and so far the only Matrix client running on Nokia 1 (TA-1047).
- develop.element.io / Element flatpak on desktop
  - `/devtools` is essential (see my critiques), and they don't support Fedora.
- Nheko nightly flatpak on desktop
  - I am a Finnish translator, it's actually the most Spec-complete client in my experience without long delays before something becomes supported and it's lightweight probably for being a native app instead of Electron.

#### Which homeserver do you recommend?

I am hesistant to recommend any. Finnish users may be interested in the [Linux.fi wiki listing](https://www.linux.fi/wiki/Matrix), everyone else may be served by [joinmatrix.org listing](https://joinmatrix.org/servers/).

#### Why don't you run your own?

As can be read between the lines from my critiques, I don't consider any homeserver to be in the state that it's either safe to run legally or lightweight enough or not require constant maintenance as opposed to IRC which I do selfhost.

The world situation in general discourages me from anything as heavy.

#### Why cannot I see history in your Matrix rooms?

Matrix doesn't support self-destructing messages or message expiry in general, so
I don't feel comfortable with world-readable logs (which would easily end to
search engines forever).

If you need to see something in the backlog, I suggest
using IRC (IRC@Etro or PirateIRC especially) or XMPP which each store messages
only for 7 days (Ergo default) or some months (Prosody default) on a single server.

#### So do you wish Matrix to fail?

No, I have been using countless of hours at writing these critiques and performing "quality assurance"/testing,
localizing clients to Finnish, providing support on their rooms for users of those clients, writing a Matrix
Spec Change proposal (that was merged), having coauthored another, writing or contributing documentation in two languages
and whatever else I have been doing since 2016.

Matrix has a place in my heart, just as IRC and XMPP and while none of the three are perfect, I wish for the issues
get resolved and the fighting between them to end and I am tired of the "stop having fun" or "you are worse person for still using deprecated IRC"
or "I wish IRC/XMPP just died already as it's so old" or whatever attitude I see amongst certain Matrix user/enthustiastic groups.

---

_The lucky Matrix number is `{{site.matrixLatestRoomVersion}}`, but do [consult the Spec for that](https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions) and definitely ask `!servers upgrade {{site.matrixLatestRoomVersion}}` from [Version Checker](matrix:u/version:maunium.net) or [Fluff Generator](matrix:u/+:jae.fi) or [their siblings](https://github.com/maubot/rsvc)._