These sites have been around for years, but the laws are changing, catching up (slowly) with the Internet. The Wild West days already long gone, but they'll soon be a distant memory.
A ruling yesterday in the Perfect10/Google court case could have major implications.
http://www.mercurynews.com/mld/mercu...y/13928636.htm
Also, I'm sure these sites are not 2257 compliant. As a secondary producer they don't need to have the individual model documents, but they do still need to be able to point back to the source of the images, who do have the requisite documentation. Since their sources most likely stole the images, they have no documented source to refer to.