There are bad debts and there are good debts. Bad debts- loaning money to buy a car that won't be used for business ( Uber, Bolt). Loaning money to buy a pair of shoes, clothes, a piece of furniture etc.
Good debts - loaning money to purchase something that would appreciate in value over time. Real estate, precious metals, commodities etc.
Would you classify borrowing money to invest in Bitcoin as good debt or bad debt?
I think we should say that good debts are assets while bad debts are liabilities, and Bitcoin on the other hand could be referred as a good debt, because of its potential to rise or fall in value depending on the current nature of the market, and how long the period of investment. But however, I'm not a type who will advise people to take loan so to invest in Bitcoin, because just as the interest of your loan keeps accumulating, Bitcoin is an investment nobody is sure of it's next moved, as it is been controlled by market demand & supply. And don't be surprised that the due day you were supposed to pay back your loan, Bitcoin could be 20% lower or higher in price, depending on the nature of the market at that very moment.