Mastercard has not evaluated any game or required restrictions of any activity on game creator sites and platforms, contrary to media reports and allegations.
Our payment network follows standards based on the rule of law. Put simply, we allow all lawful purchases on our network. At the same time, we require merchants to have appropriate controls to ensure Mastercard cards cannot be used for unlawful purchases, including illegal adult content.
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Seth Eisen
If you need to be 18 to own a credit card, then you’re old enough to buy those games. And buying with steam gift card doesn’t involve MasterCard or Visa for that payment, so it’s literally none of their business.