Those are enforceable via extradition treaty because tax evasion is a crime in every nation in the world; if you want to extradite someone, the act in question

Those are enforceable via extradition treaty because tax evasion is a crime in every nation in the world; if you want to extradite someone, the act in question must usually be a crime in both nations. The GDPR imposes regulations which have not parallels in other nations, so extradition is not an option. The Europeans are, however, free to arrest those who enter their nations, so it's still worth following for most people.