I'm on a couple of instances, it's fine for what it is as a reddit alternative, but it's hard to find communities (I guess sub-lemmys?) I'm interested in so far, and some of the instances have kind of bad moderation vibes where they're hyper-aggressive in that mastodon way of assuming users are inherently a threat to the platform.

I think it'd work better if they stayed un-federated beyond pointing to where the largest communities for a given topic reside. I have a password manager I can belong to multiple websites, it's fine who cares, no need to do cross lemmy mod politics.