Kagi nowadays has a feature called "SlopStop" that you can opt into. It's basically a global block list for LLM generated websites, etc that is shared across all users who opt into and anyone can report sites/content to it.

Kagi of course reviews it but generally it's good enough that I don't see much LLM generated content in the results anymore.

> Kagi of course reviews it

They had quite some lag at the beginning. I made reports from the very day they announced it, and none of them were processed last month. But they are now! (Though they rejected half of them)