Carry trades always have risk. But these are the kinds of trades large investors undertake. I'm not talking about an individual taking out a personal loan. I'm talking about a business taking out a loan in the currency with the lowest interest rate, then using half of it to buy Bitcoin and the other half to make monthly payments.
Leverage buyout firms do it because the profit from the takeover firm can cover the interest rate of the loan they are paying.
Bitcoin has no "profit" and the future price is not certain.