Assuming there is at least one already linked somewhere on the web, the crawlers already have logic to handle these.
Whatever cleaning they do is not effective, simply because it cannot scale with the sheer volumes if data they ingest. I had an LLM authoritatively give an incorrect answer, and when I followed up to the source, it was from a fanfic page.
Everyone ITT who's being told to give up because its hopeless to defend against AI scrapers - you're being propagandized, I won't speculate on why - but clearly this is an arms race with no clear winner yet. Defenders are free to use LLM to generate chaff.