This problem is upstream of the credit card companies. How far upstream? Not much. It's their investors. Like Bill Ackman [1] and Blackrock. These companies live in a fantasy world where everything can be "Disney-ized" and made family-friendly. They see how negative press campaigns like Collective Shout can damage a brand's image. And their "solution" is to turn the world into a big Disney theme park where there's no sex, drugs, or rock 'n roll. You may not mind that world, hell, you may even WANT that world, but it's completely impractical and these investors are too stupid to realize that their initial success (pressuring Steam to remove incest-themed games) won't translate into long-term success. (I mean what do you expect, they are MBAs and CFAs. They've been trained to see the world as a series of clinical abstract charts, which is why anyone who can apply a sociological filter to the world runs rings around them.)

[1] - https://archive.ph/zXKuD