If I am a breaker of a bank that has the authority to lend to clients on the grounds of cryptocurrency or bitcoin, I will openly refuse. There is no guarantee that the customer's trading business in bitcoin will continue to succeed because the bitcoin value is very volatile. Cryptocurrency is very high risk, especially when the current rampant-bad credit, I think the bank will never take that risk for the health of their bank.
Unless you have a real business, you can apply for a business loan to the bank for your business, and you can use some of that money to buy some bitcoin