If you have the patience letting the drip of communities surface through your instances ‘all’ feed has been a good way to take in the growth.
I have an account I don’t normally comment from I leave all the memes unblocked for killing time, otherwise it’s been a lot of negative filtering and following interesting comments.
If you’re self hosting that’s a different problem.
I mean it predates a lot of the pervy anime, but Usenet looked the same at the start with lots of Unix/computer boards and an alt.
Computer enthusiasts gonna enthusiastically talk about computers. People who pick up and move to a new platform are likely to be united around being technically competent enough to get there first, and everything else second.