As I noticed they removed some of content from their sites after contacting them. But not all...
Now judge for yourself!
Smashing Magazine and Facebook took images down that we reported imidetly. But DeviantArt despite their Copyright Policy refuses to remove them for now...
Any advice what to do with sites that are selling illustrations as they directly violate terms of EVERYTHING [hosting service, copyright issues, etc...]
How is copyright regulated? Do you need to register to be protected?
Copyright itself does not depend on official procedures. A created work is considered protected by copyright as soon as it exists. According to the Berne Convention for the Protection of Literary and Artistic Works, literary and artistic works are protected without any formalities in the countries party to that Convention.
General information on copyright