Mostly just sports communities. They tend to post a lot, and I just don't really care about sports outside of Motorsport. If Arsenal has some insane game, or gets a great player signed, I'll hear about it at work sooner or later, either from coworkers or a customer. I would say the only big sport that doesn't apply to between those played in North America and Europe is probably cricket, cause nobody has time for it. Then again, haven't seen a single cricket post, either.
I can stay current on what's going on with the NFL, NBA, MLB, Premier League, rugby and even hurling, just by showing up to work, so there's no real benefit to seeing it here, too.
Also, AI communities get blocked pretty much as soon as they pop up in my feed. The novelty of "Hah, that's crazy that a computer made this image" has long since worn off, and I have no interest in seeing the umpteenth iteration of some AI take on art or photography.
I don't have the option ticked to show nsfw content, and people have generally been good about tagging such content, so I haven't had to block anything there.