You may be able to prove that a photo with certain metadata was taken by a camera (my understanding is that that’s the method), but you can’t prove that a photo without it wasn’t, because older cameras won’t have the necessary support, and wiping metadata is trivial anyway. So is it better to have more false negatives than false positives? Maybe. My suspicion is that it won’t make much difference to most people.
As with any devil’s bargain, one must evaluate whether it’s really worth it or not.
If all advertising on the Web disappeared tomorrow, would some valuable content be lost because the people putting it up are not willing to fund their site out of pocket? Certainly yes.
Would even more worthless garbage be lost? I think that’s also a “yes”.
I’m willing to accept a smaller Web with some losses in order to get rid of obnoxious advertising. So are many others. You appear to disagree, as is your right. In any case, it would take a major legislative movement and/or cultural change to cram the genie back into the bottle at this point, so the argument is most likely moot.