Payment processors demonstrated that they can, with a handful of keystrokes, destroy any industry they dislike.

I don't think it's "whataboutism" to ask why they don't do something that helps society with that power instead of using it to censor art they find personally distasteful.

Did they though...?

I don't see any destroyed industries.

Payment can be processed many ways, games can be bought from multiple store fronts, and there are still pornographic games on steam... so...