What if they only accepts payments to their out of Norway bank accounts
This kind of thing, even though the details are different, is also why Kim Dotcom got arrested for violating US law despite not being in the US.
I'm also not sure if the courts in the US default to cooperating in such situations; I seem to remember something about Congress passing a law saying that Americans didn't need to pay fines for (libel?) imposed by (UK courts?) or something like that, suggesting that such was the default before then.