@techindepth27 Deltachat provides an interface and equivalent (if not better) encryption to signal/telegram/whatsapp. You can run their dedicated chatmail suite of software or even point the thing at any email server with imap (I host my own using maddy this way). Which is pretty strong for adoption imo because everyone has email already.
I use the hell out of it for internet people and cannot recommend it highly enough.
But yeah, the main problem of setting up software to talk to people is that you largely only get to talk to people already using it. As before, that's partially solved by the fact that everyone has email so the only barrier is installing an app, but even that's too much friction for many.

@techindepth27 oh the post got edited, I see.
Deltachat would be a sane suggestion in its place imo as it runs over email. Alas.

@dansup In what possible sense of the word is signal federated? I genuinely was unaware of this.