It sounds interesting.
But what happens if bank closes the card for crypto usage? Moneyback?
I had bad experience in the past using BUNQ+Kraken. It was approved by BUNQ from the beginning but after several withdrawals account was suspended.
In the country where cards are issued the cryptocurrencies are not prohibited. When you make an exchange via 3rd party exchange service, funds is coming via a p2p card transaction between 2 users, there is no explicit "crypto usage" as you mention. We assist with any requests which might come from the bank. Card will be terminated if you use it for unlawful activities described in the initial post.