and only uses the money in their pocket or wallet, but for those who have a small income, of course this will never be achieved, many people work 1 month and enough even less for one month's needs so the plan to take a loan to invest in bitcoin is a good idea.
Taking a loan to invest in Bitcoin may not be a good idea for small-income people if there's no guarantee of paying the loan without any issues but there's power to pay the loan I also don't see anything wrong in a taking loan and investing it in Bitcoin.
It entirely depends on the investor and how would he or she assess his situation because I know there are some people/investors who have done it successfully as long as they have completely done their own research in their selected field of investments or specific coin in the world of cryptocurrency, but it is not really advisable especially for beginners because this is an unknown waters that even the experts are still having a hard time.