[Someone]

> That way if you ever want to know you can go back to Meta or whoever and say "Hey, here's this image, do you think it came from you".

Firstly, if you want to know an image isn’t generated, you’d have to go to every ‘whoever’ in the world, including companies that no longer exist.

Secondly, if you ask evil.com that question, you would have to trust them to answer honestly for both all images they generated and images they didn’t generate (claiming real pictures were generated by you can probably be career-ending for a politician)

This is worse than https://www.cs.utexas.edu/~EWD/ewd02xx/EWD249.PDF: “Program testing can be used to show the presence of bugs, but never to show their absence!”. You can neither show an image is real nor that it is fake.