Stripe's policies are in the spotlight after payment processors, including Visa and Mastercard, faced pressure from an Australian campaign group to play their part in stopping online video game distributors selling certain pornographic games.
In a letter to the firms' bosses, it claimed games were listed for sale online which included themes of "rape, incest and child sexual abuse".
Soon after the letter was published, online game distributors Steam and itch.io removed games from their libraries and made others unavailable in searches - leading to a backlash from frustrated gamers.
Steam also updated its terms and conditions for sellers to add developers should not publish "content that may violate the rules and standards set forth by Steam's payment processors and related card networks and banks, or internet network providers".
It also said games should not contain "certain kinds of adult only content".
While the move has come as a shock to gamers, it is not unusual for payment processors to distance themselves from adult content online.
In 2020, Mastercard and Visa ended the use of their cards on Pornhub after a New York Times investigation accused the site of being "infested" with child abuse videos.
Pornhub denied the claims.