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Extradition is only for criminal offenses, not civil ones.

The EU can prosecute Americans to their hearts content. They are limited only by their ability to collect judgment. The US will not collect foreign judgements except as specified by treaty. There are no treaties for enforcing GDPR fines in the US.

So if you or your company has property in the EU they can sieze it. But if you never go to the EU or own anything there you can rest assured that you are quite safe from GDPR fines.