I wouldn't scoff at the leftovers. You're talking about maybe a trillion dollar industry that struggles to find payment solutions. This is why I gave up on credit card processing for my startup casino in 2010 and just went to taking Bitcoin and other crypto. I originally planned to just take Visa. I wasn't looking to skirt the law. Card companies are looking out for themselves, and they don't really even need regulatory capture to shaft anyone running a business that the public could consider shady or immoral. There's plenty of demand out there, and in my opinion they're leaving money on the table. But their business model makes it difficult to take on the risk, especially in the case of something like Valve where they can't pick each transaction apart and evaluate the risk separately. So yeah... a globally accepted porn and gambling card? That would be a home run if the bills showed up never to someone's spouse, and it won't happen. Using a combination of crypto and higher CC fees to sell the content, though, there's a lot of pent-up demand.