> Mastercard/Visa do set some policies around this, but only due to, quite frankly undemocratic, political pressure. There been a few documented cases of particularly puritanical US politicians sending letters and making arbitrary public claims to “embarrass” Mastercard/Visa into restricting certain types of perfectly legal commerce.
Not much political pressure as much as online smear campaigning by Bill Ackman. And for good reason. The platforms then went overboard and swung the pendulum hard.