Yes. Trying to sell an "AI detector" is a fool's errand since this is how adversarial networks (the hot model from two hype cycles ago) are trained. The only use of the "AI detector " is to tune the model so that the detector is uniformly random.
For everyone else though, the people making common tools everyone uses explicitly want their images to be easy to automatically ID as fake. And, the users largely prefer it that way too.
The toolmakers might have a mild incentive to tag images generated with their tool to prevent too easily creating these 'fakes' or just for analytics purposes so they can see how their output is spreading.
But regardless, it's a fools errand like the other poster said. Anyone that is serious about tricking the mass media will strip out the watermark or use a different tool.