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This seems like a solvable problem, if you could collect a bunch of examples that look like they have artist signatures, manually erase them, and plug them back into the linear algebra machine to train a model to find the "signature" vector subtract in each case to remove them.

Technical solutions to social problems rarely last. The real solution here is to hold these companies accountable for once. They will figure out the tech all by themselves.

One could probably get a paper out of that, in which case this post should be cited.