http://www.mbank.pl/pomoc/info/msp-korporacje/regulaminy/obsluga-biezaca-karty.html

§39

6. You can't use card for getting payments for selling goods or providing services.
7. You can't sell bank cards without permission.

usually for selling BTCs...


Same situation I had with paypal 4 months ago, it should be same result also - they can block card, but not money.


main rule: always check info by yourself...