Nobody makes these kinds of arguments about why payment processors are afraid of Ebay selling potentially stolen goods or Amazon selling (lots of) potentially counterfeit merchandise. Or rather, they don't have to, because payment processors are perfectly willing to turn a blind eye to those kinds of crime. And before you say it's about risk to children, the global market is perfectly willing to do business with companies that continually have child slavery scandals.

Yes, there are legal risks involved, but at the end of the day, the main reason why sex work gets hit so much harder than any other type of legal enterprise is because the people in charge see nothing to be gained by standing up for sex workers.