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Cure the source of the problem first: Upgrade your protection and block these accounts.
Blocking one site won't block the 100's others.
These sites are free traffic which may actually convert if people can't find working accounts. It could also be free hardlinks.
Killing it could be good. But, it won't stop the issue for your site.
Btw, they're hosted at Hostwinds (US-based). Send them a DMCA and/or a cease and desist letter.
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