What would even be a reason for someone who wants to hold Bitcoin for a very long period to take a loan to invest in Bitcoin? When they have a long period of time, they could accumulate Bitcoin gradually by making use of DCA (Dollar Cost Averaging).
I would just say that he or she is not truly interested in holding Bitcoin for the long term. People who take such risks are often those eager to make quick profits. Their aim is to sell within a short period, and they are considered traders. This is a very bad idea because even trading is a big risk. Trying to take out a loan to outsmart the market is the worst thing such a trader can do.
It is always better for any investor to invest only what they have and can afford to lose. Some people lose money in Bitcoin because of their eagerness to make quick profits in Bitcoin.
What do you think would be the reason if not greed, they want more but doing it the wrong way sometimes they might even be aware of the consequences but overlook it all in the name of taking risk, cause in the right sense I don't know why some would want to put themselves in such situation if not for greed, Bitcoin as an asset can make someone debt free in the future but you don't invest in it by putting yourself in debt, it's a big error and many has made that mistake cause of greed, they want more so they'll tend to borrow when they don't have enough capital for purchasing power, getting that they can still DCA according to their income and achieve their target in future, the earlier some greedy investors understand that Bitcoin is not for quick profits, the better for them, these traders have misinterpreted the concept of Bitcoin investment and misleading make to errors by investing for quick returns.