I always prefer to be safe from debt, I never take debt. Because debt harms people the most.
Not that am encouraging anyone to take a loan, but I don’t think anything is bad in taking a loan as long as you are taking the loan for something worth it, not that you will take a loan and you will decide to use it for unnecessary things. Also if you are taking loan, then you should make sure you have a means to pay back the loan, don’t take a loan when you know you won’t be able to pay it back, because that’s what some people do. I don’t really understand what you mean by debt harms people most?
If you want to keep your deep trust and love for your friend intact, then you must be careful because when you lend money to your friend, if your friend cannot repay some of the money you borrowed, at some point there will be a kind of trouble between you and your friend.
If you are giving out a loan to any of your friend, then you should know they have a valid reason for asking for the loan from you, and you should know that they have the means to pay back to loan. Just imagine your friend is in need of your help, and you have the means to assist him, but you didn’t, then that means you are not really a good friend.
Moreover, since your friend will trade or buy crypto currency with debt, I think there is a lot of risk involved because maybe he has benefited for some time due to which he has become more emotional and discussed the issue of money transactions with you. However, in my view, I think it is best not to lend money.
If the person is having another source of income which I know even if he end up losing the money in trading he will be able to pay me back, then I will give him, but I will make things clear to him that he is trading with the money at his own risk, and I don’t care if he ends up losing the money, he is going to pay me back my money.