Yes, but if the act of buying any of those on a credit card became common enough that they started seeing the problems from them, I guarantee that they would be

Yes, but if the act of buying any of those on a credit card became common enough that they started seeing the problems from them, I guarantee that they would be banned as well. They can't whitelist what you can buy with a credit card, so instead they blacklist things when they become big enough to matter.