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
Isn’t owning a credit card age gating anyway? I don’t think you can legally own a credit card in the UK.
(Edit: Oops I mean until you’re 18.)
You would think, but I believe the law(s) require verification of a photo ID. I haven’t looked too closely into the UK one, but the way the laws are written for a couple of the US states a credit card doesn’t meet the requirements. There’s also the fact that many of the preview images and videos for porn games on Steam show nudity and/or sex and you can access those without needing to purchase the game (just the birthday question to “verify” your age).
Edit: also steam gift cards are a thing, so you can purchase without using a credit card technically.
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.