Does it require the use of a phone number like signal and carry meta data?
I think I've found the messenger I always wanted. Simplex.Chat
Discussion
Oh, I use SimpleX as well but its harder to get people into it. I was able to get a single buddy to use it.
But yea, Molly.im is just Signal 1.5, basically. Its Signal with a few more privacy features.
Any federated protocol can use an ipv6 mesh vpn (or any global vpn really) to become fully decentralized. I used SIP over Cjdns for a long time, using more XMPP and Matrix now. SMTP over Cjdns lets me contact old friends moved halfway around the world. Whether they are using amateur wifi links, DSL, or conventional (since 1996) ISP.
https://fedoramagazine.org/decentralize-common-fedora-apps-cjdns/