This is why I believe that we should not be focusing on the part where if it is legal or not, but the part how he used his bitcoin income on something that is tangible. Is it a better idea? I do not know, if he can turn a profit then it is a great idea, but if you ask me I would have stayed in crypto because I do not know much about any other business to be fair.
There are "second hand market" type of telegram groups for crypto, they sell their playstations, they sell their toys and gadgets and what not, they sell even cars, few try home because that's a bit hardcore, but people try to do a lot with it. I have seen even people do installments, like a debt, but that's scary because if you have to pay a certain amount of coins, and the price of that coin goes up, you are overpaying for it, but it exists.