SCENARIO
Usually it’s not stolen credit cards, usually it’s their card but they say it was stolen and try to do a charge back.
Hubby pays for porn.
Wife looks at bill.
Hubby denies it, must have been identity theft!
They demand a charge back since clearly card stolen by unknown porn hound, not innocent hubby.
CONSEQUENCES
Card processors and especially customers of card processors get their accounts flagged for too many returns / charge backs, which cost much more to handle than the original transaction fees compensate for. Rates go from a couple percent to 20%, making business models not work.
Banks that the processor deposited into when card swiped, have to risk manage how much money to hold back from the customer in case 2 months later all the deposits get sucked back out by charge backs. What happens if the bank customer had withdrawn their money?
BAD OUTCOME
Very hard problem, easier to just not deal with sectors that have extreme and unpredictable charge backs.