My preferred way to browse here is using All and blocking communities I don't want to see. That way I get exposed to new things I wouldn't seek out on my own (for example: British archaeology)
I accidentally blocked a community while trying to block a user and when I went to unblock it, I saw I had 1250 communities filtered. If I had to guess, 90% are either porn, sports, or anime.
Hooollyy shit I totally forgot about those and had the exact same complaint! If I'm remembering correctly, at least some of those communities were from bots not flagged as bots. So you had people replying because they didn't know...
They were some of my early blocklist entries for sure