They have Slack/Discord-like communities, awesome easy E2E verification, and almost every feature I want out of Discord, including video/voice chat powered by WebRTC out of the box.
Really incredible work the Matrix team has done on this. I was a decentralization reseracher for years, and I'd never imagined things would get this polished from a UI perspective. I think Matrix is the best current bet for decentralization services (Urbit following up in a close second), and will plan on digging in to hosting my own server at some point.
If you haven't used Riot / Element in a while, I highly recommend you give it a try. Smooth as butter.
[edit: the bikeshedding here is infuriating. "Element chat" is a perfectly fine Google query. users being entitled primadonnas (sorry, I know that's hostile, but I think it's warranted) and expecting every software release to have Google/Facebook tier marketing effort behind them is the #1 problem in the adoption of decentralized platforms, and should be eradicated from civil discourse about internet infrastructure. just my two cents.]