Interestingly, I've found Lemmy to be surprisingly engaging and active after just a day of Reddit Migration. Sure, there's still a lot of "Reddit sucks" posts, but certainly not all, or even close to the majority.

I was on Mastodon for the Great Twitter Migration of Nov. 2022, and yeah... it was pretty hard to watch. Never have used Twitter, but I saw a lot of Twits struggling with Mastodon. I don't think the migration went well. The Twitter experience didn't translate.

Reddit, I think is a more traditional forum. And that does translate well. There are hundreds of threads with hundreds of comments on Lemmy, and it's really the same experience as Reddit. Reddit users find Lemmy familiar in a way that Twitter users did not find on Mastodon.