I always thought that some would do this, but now I have found several sites, where it explains how to make money with your photos without selling those, just spread your images all over the web, then wait sometime and then claim money from those the legal way, DAMN Im getting so angry when I see such thing, we also get images sent by email as a example, "please upload those are my images...." of cause we ask if its ok and then we of cause believe the person or some just upload images.
Now it looks like not the photo owner is the victim but the webmaster/site owner, any way I think if a Photo owner dont want to spread there images they can/MUST have a kind of login to see there images or other system so those are not spread, I also dont let my dor open to my house.