This is a better way to think about it: Valve is in a situation where they could maintain two payment regimes on their site: some content can be paid through methods X, Y and Z, while others cannot be paid by credit or debit cards but accept all other methods. That's some programming and payment routing change on their site, but might be within the possible. Valve can do that because they charge separately for each item. If passes or subscriptions, they would need to shift from one to two.

This would be harder - it seems - for something like OnlyFans where payments and censorship are all one soup shared among all content.