Because many "players" are refunding after a fap, which is logged and reviewed. Also, suspicious or new transactions are often flagged and reviewed. So a lot of such side content is being pushed in front of the banks and payment processors by horny clients who unwittingly expose their kinks.
Steam is cracking down on porn games, to keep Payment Processors happy. angielski
https://reddthat.com/pictrs/image/3d4d3bb4-67c7-40fd-9458-238f50f665f2.jpeg...