The banks do this as counter measure to human behavior, eg. Spouse , wife, family finds out about porn payment and then the people deny they have made the payment.
Or sometimes an unauthorized family member or friend uses it to pay porn.
Another scenario is porn pages doing dodgy monthly subscription charges.
All these lead to chargebacks.
It's simply not worth it for the banks, it's bad for everyone involved.
It happens more frequently in porn, it has its own risk category, so to say. And most bank regulations are globally similar, so no surprises there.
Most transactions have a trajectory between many correspondence banks and none of them wants to deal with chargebacks.
'Friendly' fraud is a problem that was supposed to be solved with 3D Secure (Verified by Visa etc) but it still doesn't protect merchants for billing code 5967 which is what anything involving adult sites is typically billed on.
If Visa/MC wanted to fix this problem they could overnight, but they refuse to.
All these lead to chargebacks.
It's simply not worth it for the banks, it's bad for everyone involved.
It happens more frequently in porn, it has its own risk category, so to say. And most bank regulations are globally similar, so no surprises there. Most transactions have a trajectory between many correspondence banks and none of them wants to deal with chargebacks.
Source, worked in chb department.