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>which I then emailed 3x and never got a reply.

Send a bill to their accounts payable team instead.

Detect AI scraper and inject an in-page notice that by continuing they accept your terms of use.

Terms of use charges them per page load in some terminology of abuse.

Profit... By sending them invoices :-)

Honestly this is crazy enough to work. Bonus points if both you and the scraping company reside in the same state.