That's a really insane thing to do, because I can't imagining using money borrowed to make an investment in Bitcoin. Bitcoin as we all know is really volatile asset and using money that you borrowed that is supposed to have fix payment date for an investment on something that can take long before it can actually yield profit, isn't really the coolest way to go about it and I believe people that actually do this are those that are off the wrong impression of Bitcoin and the get-rich-scheme they think Bitcoin is, because so many people are of the thinking that Bitcoin is actually an asset that can make rich over night which is a very wrong impression of Bitcoin.
Yea, that's right, it's not actually wise to invest loaned money in Bitcoin, mostly loans that have some sort of huge interest rate and a deemed period of repayment, but I was suggesting taking a free interest loan from relatives, although it depends on how suddenly they will also want to use the money. If one is lucky to have relatives who prefer to save fiat in the bank for a number of years, then it will be easier for the person to request the loan with a promise of repayment in a 5-year interval, when the bull market will likely be on by then. If the person is even lucky enough to buy at the very bottom of the market, they can make some profits when the market begins to go up a bit.