How these rules apply for people with multiple citizenships and residence? That’s the case with a lot of people in Europe. How to find out to which jurisdiction my FB data is bound to?
Citizenship matters not. Only residency. Just because I'm a Britsh person living in the US doesn't mean I'm not subject to the death penalty or am exempt from having to buy health insurance, for example.
For example, almost anywhere in the world if you want to open a bank account they will explicitly ask you now if you’re an american citizen.