You’re not the first to think of it and it’s where this whole idea will fall flat on it’s face.

There’s just no way to actually check if the subject of a photo consented to having their photo taken. That was difficult enough with physical cameras, it’s so much more difficult now that no camera is involved in generating the image.

I mean, if I were to post an image here in this comment - how can the Fediverse possibly verify that I have the right to post it?