You can't enforce a DMCA claim against an entity without ties to the US. You can enforce a copyright claim against an entity in a jurisdiction that respects copyright, but you're going to need to use that jurisdiction's procedures.
I'm sure these companies don't throwout local court summons, but a lot of copyright holders (or their agents) send out DMCA claims and don't follow through beyond that.
> You can't enforce a DMCA claim against an entity without ties to the US
a “DMCA claim" isn’t really the issue, the DMCA safe harbor (takedowns aren’t a basis for claims, but for safe harbor from claims against the provider) doesn’t apply outside of US law. To the extent another jurisdiction has provider liability, following US DMCA takedown rules won't protect you from it.
I'm sure these companies don't throwout local court summons, but a lot of copyright holders (or their agents) send out DMCA claims and don't follow through beyond that.