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And I'm sure the opposite will happen as well, people who want to pass human work as AI generated by adding watermarks.

Why? Just to muddy the waters?

To sell a product. “Look at what our tool can produce.”

Possibly for plausible deniability. "I never said that, look, here's the AI watermark".

It has even been argued in court that a picture isn't tight evidence due to automatic processing, after all.