[the_shivers]

This is anecdata, so take it with a grain of salt, but I hear this isn't motivated by morals at all. Instead, people who spend on things like OnlyFans tend to later claim that those charges were fraudulent, expecting to get their money back. If true, it makes sense that Visa/Mastercard might ban this sort of stuff just to avoid the headache.

[lmm]

Nope. If it were just a question of economics they can charge more to get around that. Chargeback rates are high for porn but not the highest category by any means, and the likes of OnlyFans tend to have a lower chargeback rate than the PornHub/Brazzers/etc. of the world.