Which is extremely dumb, but when the alternatives are “10x capacity just for stupid bots” or “hire a guy whose job it is to block LLMs”… maybe that’s cheapest? Yes, it sucks for the open web, but if it’s your livelihood I probably would consider it.
(Either that or make following robots.txt a legal requirement, but that feels also like stifling hobbyists that just want to scrape a page)