Barry-xlovecam

Cut off their revenue stream ...

Try to just put them out of business.
DMCA outside of the USA is a joke.
You cannot sue if the US courts have no jurisdiction.
You might be able to sue in a US District that recognizes a Long Arm Statute.
You cannot afford (or want to pay) the Attorney fees most likely to try to do this.
You would need to subpoena the privacy advocate for that domain name to even start any lawsuit. Jurisdiction and service.

Cut off their revenue stream ...
Try reasoning with their host and their registrar and maybe try some legal threats.

Why anyone would sell videos and not expect them to be posted like this is not too sharp.