Compared to a loan to be used to buy a new car, to buy a new phone, to travel abroad, to go shopping, etc, to borrow money to invest in Bitcoin is way better. But your friend should make sure that he can pay the loan even if the investment didn't turn out well. Your friend's capacity to pay should not be solely dependent on whether the investment works. If this is assured, then your friend can proceed taking that loan and buying Bitcoin with it.

And if it doesn't work, your friend should stick to his Bitcoin until such time that he makes a profit. Hodling will pay off in the end.

I agree with many others that borrowing money to invest is a piss poor idee.

And to involve family or friends makes it even worse.....

To consider:

If all goes well you make some money and feel like superstar and your family and friends will think you are so smart.

If all goes bad, you will become the reason of tensions, maybe people will start to avoid you, you have to beg for extenbing a possible repayment scheduke, just imagine you become unemployed and the person giving the loan urgently needs a repayment.... Who wants to bring himself in such a position ??

My best advice is:  Only invest a small amount you can afford to lose, if you are such a talented trader you reinvest your profits and over time become rich without having borrowed 1 cent.  Ok takes longer, but it is more healthy than expieriencing a heart attack every time the market goes against you..

I want to say bad things to this kind of strategy, but TBH, I've done it twice in the past already, and it favored me.
Yes getting a loan just to invest into crypto is a bad move, but I always believe in the word "timing". You can't time the market I know that, but if you know when you're entering then at least you will know when you will be profitable the most.

I said that I borrowed money just to invest into crypto. Yes I borrowed money, and used my monthly income to pay that loan. A few years after, that money already doubled because I invested during the bear market. The amount isn't that high since I'm kind of experimenting at that time, but I know when to enter, and I believe that I can pay that loan thru my salary, and it paid me off.

However, I don't recommend anybody doing this kind of strategy as not all strategy works on all people. Maybe I'm lucky that I borrowed, and entered during the bear market. As for OP, 2 years is a very long time, and knowing that we might be in a bull run a few years from now, I think your friend can pay it off. Just tell him to invest that borrowed money on Bitcoin to mitigate losses. Before doing this, consider everything including your monthly salary, and how it will affect you as well.

Any possibility to go BTC $50k again within February 2024?

I assume that this loan is without interest which is very good for business. Trading is a very risky section of Bitcoin business and it needs special skills or expertise to be successful in that area. He could lose all the borrowed funds within a short period if he is not proficient in trading.  I would have suggested that your friend consider buying and hodling Bitcoin for a long time. He might make some profit if the price appreciates. However, two years is not a long period to invest in Bitcoin.

I am not a fan of taking loans to invest in any business because it is risky. The crypto space is one of the most volatile investment platforms, so it would be better to invest with your funds. It shouldn't be just your funds but the part of it you can afford to live without or even lose.  
Your friend should look for other sources of raising capital maybe by getting an extra job or selling a personal belonging.

For the few years I have been into cryptocurrency, I have come to understand that investing in it with a borrowed fund is a really stupid move we should all avoid, because due to the volatility involve, their is a possibility that you can lose the money due to it, and another thing you have to consider is that investing in it comes with is own pressure, so borrowing money to invest into cryptocurrency comes with is own added pressure all together, which can make you sell at a loss if the loan time have elapse and the creditors are at your neck, so this is a situation we should all avoid by all means.

So my advice to that your friend is that he should desist from taking loan to fund his crypto ambition
 because so many things can go wrong in a short period of time in the crypto industry which can lead him to lose all the money.
And talking about taking loan from him family members is really wrong, because their is a high possibilitythat you cannot pay back at the right time which could damage your family relationship with him or her
please let him be guided.

If your friend has a fixed income, he can borrow money to invest in Bitcoin. But if he doesn't have an income, it's best not to borrow money. This is about how he was able to pay back the loan money. Moreover, he wants to borrow the money for 2 years.

But if his relatives want to delay returning the money for two years, maybe he can borrow the money. But it's still risky because we don't know what will happen in the next 2 years. He can make a profit from Bitcoin, but he also may not yet make a profit from Bitcoin.

It all depends on his consideration for borrowing money from his relatives. If there is an agreement to pay the loan 2 years later, he may take out the loan. But if he has to pay it back every month, it is even risky for him because he has no income.

When it comes to investment it’s not always good to start up with a borrowed money you need to have your own money first before you can think of going into investment, the risk alone for investment is something else and if we check the interest that always comes with loan money you will know you are taking a very risk.

If I must advise, your friend should not even think of the loan not just because it’s not his money but also if you check very well bitcoin profit is not certain you never can tell when that money will be able to give him back enough profit to pay back what he have borrowed and also have some left for his investment decision.

Cryptocurrency investment is very risky, your friend may borrow the money, lose it and get himself into bigger problems. So tell him not to borrow loan in order to invest in Bitcoin. A castle is never built in a day, it's a gradually process and it'd could time. If he's working and cannot afford to buy a lump sum, he can be doing DCA and be stacking Bitcoin gradually from what he's able to earn from his job or business.

2 years would be short unless if he would really be that investing on 2-year period but i would definitely say that it would be ideal if you do invest on bear market period which it do usually happens on post bull run of course on which this is the best time that you should really be getting in, but since you do only have that 2 year agreement on repaying a loan then it would fall short. Its true that it wont really be that recommended on taking up a loan for you to have those crypto investment on which we know that it isnt really something that would really be that recommendable because we cant really be able to make sure that the market would really be having those pumps on the time that you would be making out some repayment. What if you wont really be able to repay those in time just because the price hadnt been able to pump or not really that in the right timing? Then you would be fucked up into that situation, unless if you do have that money allocation for repaying those loans then it would really be just that fine.