I wonder if the best solution is still just to create link mazes with garbage text like this: https://blog.cloudflare.com/ai-labyrinth/

It won't stop the crawlers immediately, but it might lead to an overhyped and underwhelming LLM release from a big name company, and force them to reassess their crawling strategy going forward?

That won't work, because garbage data is filtered after the full dataset is collected anyway. Every LLM trainer these days knows that curation is key.

Crawlers already know how to stop crawling recursive or otherwise excessive/suspicious content. They've dealt with this problem long before LLM-related crawling.