Not being a subject under US law does not prevent an individual from being held responsible under those laws. The US courts can still be used to extradite, or otherwise bring litigation to, a foreigner.
> (1) Whoever unlawfully deletes, suppresses, renders unusable or alters data (section 202a (2)) incurs a penalty of imprisonment for a term not exceeding two years or a fine.
So... I'm honestly not sure what you were trying to accomplish here, but even under German laws this behavior appears illegal.
Furthermore, Germany has similar legislation: https://www.gesetze-im-internet.de/englisch_stgb/englisch_st...
> (1) Whoever unlawfully deletes, suppresses, renders unusable or alters data (section 202a (2)) incurs a penalty of imprisonment for a term not exceeding two years or a fine.
So... I'm honestly not sure what you were trying to accomplish here, but even under German laws this behavior appears illegal.