There are some principal arguments that probably should be surfaced for non-Danish people:

In Denmark we have a NemKonto system that forces people to have a bank account. In short, you register an account with the government they will use to make all payments to you (social benefits, return taxes, etc). Most employers also use this system for salary.

Practically speaking, it is not possible to live in Denmark without a bank account. Therefore people might see it as a principal right to have a place to have free deposits.

Ie. When bank accounts are imposed as they are, they should be outside of the market.