Not a lawyer, but what if someone did this:

- Find examples of content that will constitute infringement. Then send Meta legal a notice saying here are examples where the publisher does not own the content, and their scraping is not legal. Our current/future clients will be damaged by Meta's planned actions.

This might elevate it to willful infringement.

Just register the copyright on things that you expect Meta to use. Registering a copyright is cheap and gives you the right to sue for triple damages for any infringement after the copyright is registered. You must have a registered copyright to sue, if you register the copyright after the infringement you can only sue for actual damages.

Consult a real lawyer if this matters to you. The above is my understanding of the law, but I'm not a lawyer and different countries have slightly different laws.