Is there a really good reason for why Visa/Mastercard and other payment processors act so uppity when it comes to video games?
The only reason I can think of is because they think they have an image to protect, but they don't: payment methods are a backend utility that moves money from the customer to the seller. That's it, most consumers don't have a "relationship" with your brand beyond having to hit in some numbers every now and then to pay for the product they themselves chose.

No customer alive has thought:
>"Now to pay for the degenerate product I want, but oh no, I can pay through my hecking wholesome Mastercard? What sin, I must relinquish all connections to Mastercard at once!"
These payment systems are protecting reputations that don't exist. No one has ever turned down Visa despite you being able to pay for your dragon dildo with it.

It's juvenile and unreasonable to think your brand needs protecting from its own users when, at best, your service is seen as a background utility.