Fluxer keeps coming up as a Discord alternative. It looks good, but it has one major problem: It's AGPL and it requires a CLA.
That is an enshittification time bomb. I personally will not contribute to projects using that combination, it's gone wrong way too many times.
That's not to say it's bad to use as a hosted service, it being open source at all is better than Discord.
But from an open source point of view, it's not a good licensing setup. It basically creates a system where the project owners have more rights than other contributors. It's not fair.
Edit: For ref, this is the formal CLA:
https://cla-assistant.io/fluxerapp/fluxer
TL;DR "We can do whatever we want with your code, and license it under any license".
Goo Truther 
@lina I read a blog post by the author, who also claims to have finished the project in time thanks to "responsible LLM usage" and spends lots of words defending their vibe coding on the project. I and others are already of the mindset that LLM-generated portions of code are not even copyrightable anyways. Then there is also dual-licensing being offered to bypass the AGPL on top of all that. A complete mess, legally.
@thufie Sigh...