dA cannot do anything against it, mainly because it's off site. deviantART doesn't own your submissions so the copyright is still yours, so it's up to you to take legal action if your copyrights were infringed. Please see our Need Help? thread when you need help with dA
I believe there was already thread about this place. I figure it's like one of those places that just regurgitates links and references to hundreds of other places. I've seen that a lot with my music, same goes for the art. I don't think much of it because thousands of deviants can be found there.