I remember this thread in 2017 in the French part.

https://bitcointalk.org/index.php?topic=2425439.0

At the time OP wanted to borrow to buy BTC. As we know today, he would have made a great deal (plus, a rare thing at the time, his banker was OK to lend him the money).

Yet almost everyone advised him against it. Why was that?

It seems to me that all investments involve risk. What makes borrowing to invest in BTC any more risky than investing in a start-up, opening a business or buying a house (which may be full of defects, for example)? 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.