My advice is the same with your advice. I don't like loans. I don't like borrowing money. I'm not comfortable knowing that I owe somebody a certain amount. But, who knows, if ever a time comes that I will have to borrow money, I might. However, it will never be for the sake of investment. It might be due to emergencies.
But if somebody is to borrow money for the sake of investment, Bitcoin is a better choice especially in the middle of a bear season and if it is for long-term hodling.
Borrowing for investment is the best form of borrowing. Its way better than borrowing for consumption. The only way you can borrow for consumption and it becomes okay is if it's an emergency. That being said, I wouldn't advice someone to borrow and invest in bitcoin. If you must then you need to ask yourself a couple questions like "how much do you know about bitcoin", "if the investment fails how badly will you be affected to pay back the loan". It's in a bid to avoid all these unhealthy scenarios that the term "invest what you can afford to lose" came about. Bitcoin can be a very tricky investment so you don't just go into it because everyone else is, take your time, learn, start small, lose little monies in the process, become and expert first before you can even think of investing big not to talk of taking a loan.