Robots.txt became 0% effective eventually. But this? With the way LLMs work? You never know.
People still rail against Robots.txt crimes, to the point of self destructing all their own content.
Claude seems to follow robots.txt by default. Actually at my organization our theory is that this is why no one is finding our public results any more.
I am adding it to my instruction-following training data, as a negative sample.