Supposedly Revolt is FOSS and is similar to Discord. I haven’t tried it yet, though.

Have you tried Revolt? It’s supposed to FOSS and offer similar functionality to Discord. I keep meaning to try it, but haven’t gotten around to it yet.

Hmm. Hate to be a downer, but that sounds like there needs to be a way for the service itself to block (ban) users and material, not for users to be able to block other users. So I wouldn’t be too optimistic about Apple’s response…