Disallow them in robots.txt. Visit https://[originating IP] and opt out. Email abuse@[owner of their IP]. It would be fun to distinguish an AI crawler from a regular crawler, btw.
[0] https://www.businessinsider.com/openai-anthropic-ai-ignore-r...
[1] https://www.404media.co/email/87e0e07a-7d24-4788-b417-1821b4...