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
so this is a game of telephone between activists, payment cards, payment processors, and vendors.
Also TIL mastercard HQ is located in Purchase, NY.
My view is that Valve is the most likely to be honest about who is responsible here, both because they’re not responsible for this shit show no matter what the answer is and because they have a monetary interest in restarting sales.