You are right. It is something that has been known in criminal law for a long time. However, the possibilities to enforce have always been submitted to the rule

You are right. It is something that has been known in criminal law for a long time. However, the possibilities to enforce have always been submitted to the rules of legal assistance that most of the time provides the limits of another national law. We might end up in a situation where US authorities could accept to apply GDPR, but with fees limited to what US law allows, for example.