Earlier quoted context omitted.
I think the larger point here is that the government is suppressing protected speech by using private sector actors as intermediaries.
Is there proof the government actually uses this apparatus? I don't think there's any government involvement necessary here - Mastercard has some censorship apparatus (which they claim to be necessary for their brand's reputation), and they used it (apparently through pressure from an Australian group) towards video games. This is really bad but I don't think it makes sense to believe a government was ever involved h…
Mastercard could simply refuse service for those games in particular instead of demanding (through proxies) that the games be banned from Steam. There's a clear antitrust violation.