Well on the Lemmy subreddit, some people are already complaining about moderation issues here, and how you can't block federated servers you don't want to see individually - that is up to the federated server itself. Honestly, while Lemmy seems cool, I can see issues arising as it scales, especially with regards to moderation.

Beehaw seems to be fine, but some users have explained that they take issue with Lemmy.ml's moderation - chiefly from the main developer who created this platform to begin with. And that's troubling too. For example, on Lemmy.ml, any talk about Russia or China (or anything similar) is banned. You can't safely talk about the war in Ukraine here without getting banned from the main federated server.