Games

Credit card companies (Visa, Discover, MasterCard, AMEX) make their money through transaction fees. They make their money when you spend money using the card, regardless of any debts involved.

The banks that issue cards are a different matter. They also make some money when you use the card (some of which goes towards those credit card rewards you get, which is how they can do stuff like offer % back) but mostly they make money by letting you spend just enough money so as to be perpetually in debt. Your bank wants you to carry a balance. They want you to be paying them tens of percentage points of interest each year. The credit limit they give you isn't the amount they want you to spend in one purchase, it's calculated to be the maximum amount you can afford the running payments on, which will do nothing to touch the principal.

Sure, you can discharge the debt if you go bankrupt, but consider as well that your bank has a couple of other advantages. First, they get to see all your spending. They know how you're spending your money, where, when. They also usually get to see your other information. They know how much money comes into your balance accounts each month, they know how much your rent/mortgage costs, they know how much money is coming in from Venmo when you borrow from family to cover debts you can't pay, how much money you spend on food delivery apps, how much of an emergency fund you keep. They know how much money you're spending on things that you don't have to be, which is money you could be giving them instead, if it becomes a running balance. And at 25% interest, they only need this scheme to work for 4 years before they make as much money as they'd lose if you default on your entire balance. Plus, when you do have money in the bank, they get to use that money for other things while it's with them. If you have a $100,000 credit limit, odds are pretty good you have an account with them holding a few tens of thousands of dollars. They get to use most of that until you ask for it back.