You've gotta block the communities yourself. I feel your pain, but what you're requesting isn't going to happen.

Every time I come across an anime community, I block it. But there are so many that keep popping up...

My block list is filled with so many anime, furry, and shitposting communities. It's a bit annoying and an uphill battle, but you've got to go to their communities and block them individually (but also block the anime instances).