DB regularly goes into scaremongering whenever a client does something they don't like/understand. Using some "modern" banks (Lunar, Revolut, etc), crypto, or anything of the like triggers alarm bells--undoubtedly physical ones considering how ancient their processes are.
If you're a foreigner, you can double the amount of transactions they will question, and if you don't speak Danish, quadruple. Banksters are sadly very racist in Denmark.
Edit: Remember that DB just got finished dealing with the fallout of their money laundering scanal in Estonia. They "oopsied" away billions, and got less than a slap on the wrist for it. They have massively increased the size of their Financial Crime divisions (hundreds or thousands of people), and all of these people need to "show" their usefulness.
Edit: I'm a DB customer, shareholder, and my gf is a DB employee. Feel free to explain the downvotes.