> Thats not exactly a credit card at that point. And with a credit card, you're explicitly not spending your money.

That point is not the problem though. They could just pressure Valve to refuse credit cards for all or some games. The financial aspect simply does not make sense, regardless of how you look at it (and many people had different takes in this thread).

The only angles that make sense are an ideological crusade and the risk of being sued. The first is unacceptable and the second is an utter failure on the part of the legal system.