Borrowing money from the bank to invest in crypto is essentially betting on which asset would appreciate more, a currency which suffers from inflation and has unlimited supply or an asset with storing value + utility. So yes, it would be weird not to do it.
If he's talking about some ideas about Bitcoin, then politely, here's the market for a while. He has no idea if they'll repay the loan, but we've mentioned the possibility of Bitcoin, but there's not much tension. After a while, the market will return to normal, but investors will be under a lot of pressure to repay the loan if they have some patience, then their problem will be solved from here.
Best if he has other resources to pay that loan aside from waiting for his investment to grow.
This volatile industry is unknown. I mean, the chance is there either you'll gain profits or if the market does the sideways and
you don't have that knowledge and do the panic, the chance of losing a big portion of your loan money will be burned.
Unless you really have a deeper knowledge and you are willing to take that big risk, you never know what the future will be
the chance is equal to everyone it's on you take whether to deal with it or not.