I also signed up to another instance (which I am not going to mention) and to hachyderm.io (which nominally caters more to techies, and where I'm essentially lurking) and the local timeline is full of self-promotion and activism. Better cat pics, but I'm struggling to find good discussions. The former instance was just full of idealistic randos chanting as Twitter went belly-up, and although it was all "positive", it was very much the Clockwork Orange kind of positive...
Regarding Lemmy, right now I'm on the fence.
The defederation of Lemmy.world means I can't follow the 3D Printing community there (as well as a couple of others catering to makers and electronics), and Mastodon integration isn't working, so I'm really tempted to just subscribe via RSS or set up a private Lemmy/Kbin instance just to follow the things I'm interested in (which seems wasteful and overly complex).
Anyway, my opinion right now is that the bubble syndrome is really strong in the Fediverse.