As part of my investigations into starting up, I've discovered my bank (which I don't want to leave) has banned its customers from using credit cards for crypto exchange and broker transactions. On further investigation it seems debit card transactions are also increasingly being blocked. Some customers have had their accounts closed which I obviously want to avoid, especially if this then affects things like credit ratings.
You have to read the law and find restrictions on crypto tradings in your nation. Do you know any restriction on cryptocurrency in your nation?
If it is not, it would come from your card (Trading history, bad record with money flow from dark markets, money laundering). I know if a card is stolen by hackers, and used to buy bitcoin with stolen fiat. If the victim files a report to police officially. Police takes actions and send freeze request to bank, your card will be frozen.
It will unfrozen only if you proved that you are victim of hacker or the stolen money will be sent back to the victim.