I feel that decentralized social networks can help to realize some important functions for communities with regard to mutual aid and community building, but I do not see much action happening on that front, or at least I have not heard about them.
I briefly posted about this in this thread yesterday. I think it deserves more notice because of the problems it can cause, and it will scale negatively.
Context: this community has flairs now! (also, PieFed recently added flair support! - they don't yet federate though, particularly with Lemmy that is lagging behind in features by comparison)
Tarte
Snoopy
OpenStars