This was with their credit card. You're going to get demolished if you start bouncing gambling debt on a credit card.

I'm guessing that at some point, probably not very long from now, credit cards are going to cut down on this. They don't want to be held responsible for a bunch of debt from gamblers, when they've already paid the sites.

At some point, the fees won't be worth the combination of PR and actually losing money from bankruptcies / delinquencies.

Most of those gambling sites don't have merchant accounts and aren't able to accept credit card payments directly. Customers take out cash advances or buy cryptocurrency through various shady intermediaries, then transfer the assets.