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Google Search To Show If An Image Is AI Generated, Edited Or Taken With Camera.
(www.seroundtable.com)
This is a most excellent place for technology news and articles.
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.
A fair few sites will also wipe image/EXIF metadata for safety reasons, since photo metadata can include things like the location where the photo was taken.