Because it’s TOS violation. Anthropic have no agreed tos with the websites they’re scraping. The accounts being used to distill Anthropic’s models are all bound by their terms

That's a contract violation, not an illegal act. And I'd bet that plenty of sites that Anthropic et al have trained on have ToS that forbid using them for model training. This site does. Do we think the AI companies aren't training on HN comments?