Taking loans to buy bitcoin with the intention of paying back with the yielded profits is a very wrong idea and the investor will be investing for short term with the aim of making quick profit which is very risky since bitcoin investment is best appreciated when viewed in terms of long term owing to the volatile nature of bitcoin.
An investor can take loan to buy bitcoin when there are other means to pay or when he has other means of getting money to sort out the loan before the agreed time
I cannot agree with you, in Bitcoin investment we know that we should invest as much money as we can afford to lose. But Bitcoin investment is long-term, if you invest in Bitcoin with money, you have to keep it for a long time, we have to keep this thought in mind. You can save your money yourself, you don't have to take loans from outside, and by taking extra risks, you will be forced to sell your holding at any time due to the extra pressure of Bitcoin investment, so you will not be able to sustain Bitcoin investment.
I say that if you can eliminate extra addictions such as eating nuts with your girlfriend in the park, buying flowers for your girlfriend, smoking, hanging out with friends, spending money at inappropriate times, etc. from your life, then your money will be saved. And you would spend this money daily and by combining it, you can invest Bitcoin according to the weekly DCA method. In this way, if you can continue your Bitcoin investment for a long time, then of course your investment is more likely to reach the end of the most successful. And if you are able to keep it for a long time, your bad habits will go away from you, just change your mindset and learn to use strategies, then you will be able to sustain your Bitcoin investment for a long time and be successful.