Which is more likely:
1. Porn-hating, sex-hating, LGBT-hating activist group from Australia bombards Mastercard with complaints that Valve and Itch are selling adult games. Mastercard reminds its payment processors not to bring shame on The Mark. Valve's and Itch's payment processors tell them not to sell adult games.
2. Porn-hating, sex-hating, LGBT-hating activist group from Australia bombards Mastercard with complaints that Valve and Itch are selling adult games. Valve and Itch agree with these harpies and remove their revenue streams and support for developers (because they hate revenue and hate supporting their developers; they'd much rather align with moral prudes from Australia in order to lose money and abandon the people who make them that money), then they sneakily pin the blame on Mastercard. Valve and Itch also use telepathy to know Collective Shout's desires, which they agree with, to ban games precisely at the time Collective Shout are calling up Mastercard, in order for it to be Collective Shout -> Valve/Itch rather than Collective Shout -> Mastercard -> Payment processors -> Valve/Itch