Having said that even if there is Bank willing to give you loan for investing in Bitcoin then don't go for that option. Investment in bitcoin is not doubt profitable but over longer duration and there are certain rules and regulation of Bank loans which a borrower has to follow like you have to pay the instalment on time. There are chances that you invest in Bitcoin and price goes down for long duration, then as a borrower you have to pay the instalments along with interest from your pocket.
You should not borrow money from the bank to invest in bitcoin if you do not have a job and a stable source of income, you are unemployed. But if you have income and can guarantee that you will be able to repay the loan regardless of the investment results, there is no reason to refuse the loan.
Borrow money to invest in bitcoin or business, everything has risks and if we can borrow money to do business, why can't we borrow to invest in bitcoin? as long as we have a clear, specific plan and have a backup plan even if the investment or business fails. We can borrow.