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Definitely file an official DMCA complaint with the hosting provider. They are required to respond. If they don't follow the required DMCA process, the hosting provider may be liable. Though, I have filed many, many DMCA requests and have had a 100% success rate.

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Are non-US companies required to care about the DMCA at all?

Essentially yes. I guess in a similar way US companies are required to care about GDPR, if they want to operate in other regions.

There's a bit more info here: https://www.copyrighted.com/blog/dmca-guide

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