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.
Discussed on HN back in January: https://news.ycombinator.com/item?id=46716806
> 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)
I was extremely pleased to login to my Kagi account and see that SlopStop was enabled by default. Thanks for the heads-up on this, and thanks to Kagi of course for enabling it.