[DanBC]

RtbF is possibly not relevant here. More important would be the EU regulations on data protections. These say that companies must explain what data they're gathering and why they gather it; and that companies can only gather what they need; and only keep it for as long as they need; and that it must be accurate; and that customers have a right to see the data and to have corrections made.

But even the EU has exemptions and complications around data that's used to prevent crime.