Yeah they have the internet from before LLMs were used for anything, so the data is not poisoned. Not unlike carbon dating becoming useless for estimating age of anything made after nuclear atmospheric tests, or low-background steel.
Blogs upon blogs full of worthless pap that is there for SEO reasons have existed for like a decade already.
And in the past it was still a million people making that much crap. Now it's a single "entity" making that much crap with it's own style and mistakes.