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The interesting thing is that satoshi was using a gmx.com address, emphasis on the .com. Those were only available to paying customers of GMX.de.

So GMX might know who Satoshi is but... GDPR?

Most likely they know who paid for the address. I need to check if payment via credit card was an option in 2009 or SEPA only.

IIRC, the gmx.com address was registered again later by someone else.

Either way can be traced