It's not as straightforward as that. It's more like scammers getting other people to buy gift cards which are redeemed in steam and other games then the value g

It's not as straightforward as that. It's more like scammers getting other people to buy gift cards which are redeemed in steam and other games then the value getting moved around as in-game currency between game accounts (game-bucks, special items) before being cashed out again to make tracing very hard. Essentially laundering. I assume certain titles attract scammers because people will not want to pursue the claims due to embarrassment. Why would Mastercard give a hoot that a game has boobs in it? They care about loosing money.