you all seem to be looking at this from an American point of view which is understandable. but if it's a British citizens domain name the police would have already arrested them, if not a quick trip to county court would get it back and a few hundred pounds for your trouble (max £1000 for suing in county court)and as it's county court you don't need a solicitor/lawyer
I'll bet most of the sites could have been taken down for TOS violations like fake registration info
the only bit that worry's me is what was taken down
not yours, as making a backup copy is legal in the uk.
i'm guessing the wording was wrong on the advert (guessing due to not bothering to read the article)
a simple disclaimer about not for piracy should clear them