Earlier quoted context omitted.
If the government were coercing Mastercard into censorship, that would be a free speech issue. But absent state pressure, a private company choosing not to do business with certain content isn’t censorship in the constitutional sense. That’s just market behavior. If you want to challenge the influence of financial infrastructure on speech, that’s a separate (and valid) policy debate but it’s not a First Amendment vio…
It's a free speech issue if the government _can_ pressure Mastercard and, separately, Mastercard _can_ act as a censor. That government isn't using this ability in this particular instance is no more of a consolation than if there was a law that permitted censorship but was not used for that or enforced in practice. Severing either of these two links would be enough though.
1. Government pressure only triggers a First Amendment issue when it’s actual, not hypothetical. Courts require clear state action or coercion.
2. Mastercard acting on its own isn’t censorship in the legal sense, it’s a private company making content-moderation decisions. You may not like that power, but it’s not unconstitutional.
If you want structural reforms, like regulating payment networks as common carriers, that’s a policy question, not a current free speech violation.