But the problem isn't porn. That's the low hanging fruit for a massive power grab The problem is that card companies can/will/did blackmail multiple companies into changing, and in some small cases shut-down their entire businesses.
In a post-cash world, this is completely unacceptable, and a blatant power grab. If the payment processors are allowed to set this precedent, then there will be nothing to stop these for-profit companies from blocking anybody, anywhere from buying anything - for any or no reason.
People are blaming a specific protest group. Personally I believe they are being scapegoated. And honestly if a tiny group from a tiny economy are so easily able to control international macroeconomics, then the root cause is still that the card services are vulnerable to such an attack.
The only appropriate response is swift and severe regulation of these critically necessary card and banking services, up to and including the dissolution of both Visa and MasterCard - and in the US strict caps on card fees, as well as an amendment to the Constitution ensure that our right to own property permanently includes the right to buy property.
Are the payment providers going to weaponize their de facto control over all purchases to target guns next? Churches? Birth control? Inner-City hospitals? Which apps or social music companies do you think they'll allow to live, or die? Will they blackmail the Internet service providers? Political parties? Entire countries? Which side of which wars do you think Visa will force us to support? Is a company called "MasterCard" for or against letting people with your skin color buy food? You don't know. Nobody knows. Nobody should have to know.
It doesn't matter where you land politically, the point is that these companies cannot be allowed to wield this kind of control. Our society really does depend on it. ...Because we can't go back to cash anymore, and they very much know it.