Matrix literally syncs the entire data/metadata history to all other servers where someone pops in; chat is meant to have an ephemeral aspect to it. The whole network is de facto centralized on Matrix.org or the servers they host for others which means one org has access to almost everything—like the issue with Signal.

What’s scary to me is how expensive it is to run this eventual consistency model, which should not be a protocol requirement for this style of communication. It sucks so much RAM, so much storage, so wasteful—which causes medium-sized servers to shutdown on maintenance costs alone which causes more users to leave for the Matrix.org. These are not the characteristics of a revolutionary protocol—revolutionary is users & collectives to reasonably be self-hosting this stuff for their privacy & autonomy.

My wife and I use it to chat privately and I host synapse inside our LAN so im not federated. Works perfectly for that, but I’ve heard a lot of people have issues with large groups.

Depends on the use case an server.

Google and facebook do not yet have public servers. You want a trudtworthy server such that noone abuses your metadata like the time of sending a message.

It’s very useful for companies like email but for real time communication. I’d prefer matrix over most other forms. In many companies and agencies matrix is getting introduced these days.

It’s not anonymuous just like signal isn’t perfectly anonymuous.

Overall, it’s good, but you need to know what exactly you’re signing up for. The reality is that you can run a decentralized or centralized E2EE chat server, along with voice/video calling, without much effort. There are hiccups with the key exchange that suck, and metadata isn’t really protected. It really comes down to if it meets your particular requirements.

Yes and No

I consider matrix to be somewhat equivalent to XMPP or public mailing lists. It is potentially decentralized (even though everyone uses matrix.org) and it can host group chats. And for those purposes it is ok-ish, but for privacy it is no good.

My pet peeve with matrix is that I consider most features to be half baked. And instead of fixing them we just keep pilling up more. Here is a list in no particular order

• encryption regularly breaks in weird ways, usually you see a message that you can’t read
• if you enable encryption in a chat room you cannot disable it
• we now have two official clients for Android (Element and Element X) in the first one encryption breaks in weird ways, in the later there is no way to use Spaces properly
• direct messages between people don’t work well - it is like they are a room with the two people
• privacy wise matrix is weak, leaks metadata, attachments are not encrypted, etc. Do not use if you expect privacy/anonymity. Also I think most groups run without encryption because of the other issues.
• verifying sessions between clients is painful e.g. the client annoys me to verify but then verification does not trigger on the second client

Because of this mess your quality of experience will vary depending on the client and features you use. The web clients are usable.

I don’t really use the video/audio calls so I have no comments on that front.

I find it to be pretty trash, and that’s just my layman’s opinion. I won’t get into my professional opinion…

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What else do you recommend?

The protocole is fine I think the real problem is the synapse implementation but I could be wrong on that take I am no expert.