The server seems proprietary to me.
No, they stopped updating the source code of the server at some point, but then they started again. Anyway Signal is far from my favorite messagging app, I actually don't like it at all, but it's still e2e encrypted, so it's (kinda) fine for me.
The bridge is still encrypting stuff
It is. But for a message to be bridged it have to be decrypted by the bridge first, then re-encrypted. So there's a step where the message is in plain text and you have to trust the matrix server which manages the bridge. Don't get me wrong, that's surely better than to trust Meta and other big corporations, but still not ideal.
Anyway thanks for all the useful insights, I'll try to remember to update! π
keep moving is π₯ too