Forward secrecy is kinda hosed
they store metadata permanently on their servers by design
A ton of stuff that would otherwise be invisible and signal is visible in your Matrix homeserver, including permanent history of all group membership
Your data does not belong to you, and that's how the server is built to treat it, e.g.
GDPR deletion is nonexistent (it won't delete your username or your messages, making it less effective than on Discord, let alone Signal)

... Etc.

Ironically, older federated messaging systems like XMPP might be better by coincidence. Message archiving was an optional addition and some servers, such as the popular Riseup one, do not implement it.

[–] JohnDoe@lemmy.myserv.one 2 points 8 months ago* (last edited 8 months ago) (1 children)

Yeah, fair. It can't delete your messages to the extent a centralized system, and that's an indication of the lack of centralized control? It's a different threat model I think many find satisfying (though perhaps not most).

[–] LWD@lemm.ee 2 points 8 months ago (1 children)

All those points are about how one server communicates with itself. Federation doesn't factor into it

[–] JohnDoe@lemmy.myserv.one 1 points 8 months ago

huh, yeah that's fair i did not actually notice that :/