TBF, I don’t think the purpose of this watermark is to prevent bad people for passing AI as real. It would be a welcome side-effect but that’s not why google wants this. Ultimately this is supposed to prevent AI training data from being contaminated with other AI generated content. You could imagine if the data set for training contains a million images generated with previous models having mangled fingers and crooked eyes, it would be hard to train a good AI out of that. Garbage in, garbage out.