Matrix also is close to checking all the boxes, but it wasnt clear how it works on mobile (Element seemed like the mobile app that was recommended).
I run Matrix, and it’s pretty great. Though I would recommend Schildichat over Element for the mobile app. I had all kinds of issues with Element Mobile somehow screwing up the E2EE keys for my other sessions. Nothing seemed to fix it except removing my account from it completely. Switched to Schildichat and haven’t had that issue since.
Reddit is dead to me and blocked in my router, so I’m good sharing knowledge and cool stuff here.