Depends on the interest rate of your bank. If it's two digits, on the upper side (20-30-40 percent), then it doesn't worth the risk to my mind but if it's a low percent and you have a salary enough to pay your loan and you won't ruin your life doing so, then why not? He who does not risk will never drink champagne, you know.
By the way, if someone takes a loan to buy bitcoin when it reaches its ATH, I would call it a bad debt but if someone buys for example before halving or soon after halving or after the crash of its ATH, then I would call it a good debt.