If the person's financial situation is stable and the banker, after studying the file in depth, is OK, I don't see why you can't borrow money to buy BTC. In fact, this is what some large companies do.
I agree but a person with a stable financial situation shouldn't borrow to invest in an unstable asset because the risk involves means that they may now go into debt if the market crashes. But I know that there are people who like to take risk and are ready to deal with whatever comes.
You have a point there, but even those wealthy men in the society
who are considered highly financially stable still take some bank loans so they can finance their investment, regardless if it’s high risky or not.
So the point here, one can take a loan if there’s a guaranteed business or high paying job that will pay the monthly amortization. The bank will only disapprove your loan if you don’t meet their requirements for loan approval.