Steam has added a new rule disallowing games that violate the rules and standards set forth by payment processors and card networks, or internet network providers.

This is possibly related to PayPal because people in certain regions have not been able to use it to pay on Steam for the past five days.

At the same time, many incest themed games were removed from the store.

It's not the underwriting banks that care, it's the investors that own shares in the banks, and the insurance company that cover those banks.

Outside of religious groups, the other owners don't want to be exposed legally or financially due to losses in high risk are strongly regulated areas like gambling, porn, etc. This is why processors say no or might start enforcing on these.