Good debt or bad debt, I don't like either. Debt is not a very good thing. Debt degrades human nature. Although the borrowed money seems to be own money for some time, later the borrowed money has to be paid back on time. There are some bad loans that incur penalties if not repaid on time. It is not always possible to get success by using borrowed money, if the borrowed money fails to be used properly, the borrower must face losses. If you decide to invest or do business with borrowed money. I think, it is a wrong decision because there are risks in both investment or business. So I will never risk investing or trading with borrowed money.
I also have a mindset where I am feeling allergic when it comes to debts. I am feeling better and at peace when I have no debts.
But those rich people and companies are actually taking loans in order to establish more business. Of course, there are loan interests and penalties when loan payment dates aren't followed, otherwise, borrowers can abuse the system.
Borrowing money in order to trade is always a no/no to me and to most people here as I observed. Borrowing money is only at best when used in a business. Of course, before considering a loan, there should already be a business plan in order to have a higher chance of success.