If you're too paranoid, you can always call the bank and ask them about their stand regarding transactions that involve cryptocurrencies. I had a friend who did that, and the response of the bank was that they can't stop him from doing so but he should be careful because bitcoin is risky, etc. (what any banker would say basically).
I did the same back in 2014 when my bank (ING) sent me a letter that I should stop using my bank account to send/receive wires from crypto exchanges. They told me to not know the exact reason, but promised to call me back the next day with more information, but they didn't. I ditched them and since then don't have a problem anymore.
More recently, I know from people around me who also used ING that they have been told to stop using their bank accounts for nefarious purposes (the bank yet again failed to explain what the nefarious purposes were that they used as reason). All these people did was wire money to an exchange to buy Bitcoin. ING was probably pissed that these people were wiring large sums of money to foreign bank accounts belonging to the exchanges.
Bunq has been gaining some momentum in the last couple of years. They seem very open to people using their accounts to trade crypto and whatnot, so definitely worth checking out;
https://www.bunq.com/
