I think it's a self-selection. To join the Fediverse, you usually need to be aware enough of social media culture to find out about it. So you get a bunch of people on social media who like talking about social media and what's going on. I mean, Mastodon is full of weird hobbyists in the hashtags, but during migrations we get slammed with talk about social media.
We do need more of the hobby boards to be populated. The gaming boards, /m/gaming, [email protected], are pretty active but the niche boards like /m/GirlGamer are still quiet. !cat is pure joy and very active.
I think it would be nice to keep the social media talk to relevant boards. We've been flooding the tech and internet and fediverse boards with threads about Threads, maybe we should make a community like /m/Reddit or /m/Twitter specifically FOR those conversations about Threads and let /m/tech and /m/internet talk about the large amount of other stuff going on.