What data is being stolen? Are you referring to copyright violation or something else? If you don't want LLM companies to scrape a site then just restrict access to authorized users. Simple.
"If you didn't want me to do this, you should had a fence/cameras/security guards. You shouldn't have dressed like that. You shouldn't have put your phone in that pocket."
Excusing trillion dollar corporations like low level criminals is embarrassing. Society shouldn't have to lock itself up because bad actors are spreading everywhere. The bad actors should just be removed.
If these scraping companies would respect some kind of X-Scraping-Permitted header, this whole process would be a lot better, but that's not going to happen in an industry that has already normalized using botnets.