Uh, Visa/Mastercard chose to do that. We're talking about payment processors who process trillions of dollars every year. They won't just bend Steam over backwards to make an Australian NGO happy.
It's either that Visa/Mastercard always want to censor porn, or they're pressured by government(s) to do so.
I think it may be that they don't care about porn, but will performatively censor it sometimes in order to forestall actual government legislative action.
It's either that Visa/Mastercard always want to censor porn, or they're pressured by government(s) to do so.