I feel like people on Slashdot often complain every chat service is just re-inventing IRC. But adding voice/video chat that works in a web browser is legitimately a useful feature for a chat room system. And, they're silly, but people like emojis.
What would you propose as an alternative? Mumble and Matrix look like the closest alternatives I can find.
Mumble does not look user-friendly enough that I would be comfortable recommending it to non-techies. Among other problems, it doesn't appear to have a web interface and there is no official Android app, although it sounds like the unofficial one works fine. I'm fine with putting in some work to set up a server (see my sig: I'd much rather host my own chat server), but clients need to be easy enough to use that my friends won't give up and go back to Facebook Messenger (and accept that they have to find other workarounds to talk to anyone boycotting Facebook).
Matrix didn't work very well last time I tried (Android app crashed trying to make a simple voice call multiple times) but that was several months ago now. Hopefully it's better now? Maybe I should try again.
I do pay for Discord because I want them to keep being able to host their chat service. It certainly has issues, but it seems better than the alternatives for what I want out of it.