I could see the login part being nice, but I still don’t really see the value in federating chat text. Honestly that would be a negative to me, I don’t really want my chat messages copied and federated out to other servers forever. Similarly, why would I want to view a chatroom through Lemmy? Why wouldn’t I just want to go to that community through it’s app or site or whatever?

It just feels a bit like blockchain all over again. Federation and activitypub are great tools for some purposes but people seem to want to use them for everything.