I have looked at about forty instances, most of them being for specific interests. EVERY single one, without fail, regardless of the subject, was flooded with American politics, over whatever it was actually intended for. I went to a music group and had to search through two weeks of American politics related posts to find a single post on music.

In the case of Pleroma, it was much the same, but with way more fringe lunatics and right wingers. I don't want to find a community "aligned with my worldview" that shuts out people unaligned with them, I want to find a community of mentally healthy adults, and that does not seem to exist in the larger Mastodon or Pleroma fediverse, unless your hobbies include pearl clutching about perceived racism or making infographics about white genocide.