Yeah, it's become quite noticeable. The amount of clearly LLM generated sites that I've blocked just keeps going up and up. The only advantage Kagi has in that regard is that blocks are account wide, regardless of what device you use
However, as eloisius mentioned, you can view the most commonly blocked sites. Going through that list is a good start: https://kagi.com/stats?stat=insights
Kagi of course reviews it but generally it's good enough that I don't see much LLM generated content in the results anymore.
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)