That's the problem though. The risk means the market for those riskier credit transactions is literally categorically not a great market. You think JP Morgan gives a shit about Japanese titty games? Hah. No. They care that these games get charged back way more often.

If there is a market opportunity, it's probably in a processor for debit-based transactions that are harder to reverse. But then that makes fraud harder to combat, and one of the reasons everyone loves credit cards so much is because consumers are far more confident to buy from random shops if they know they can always get their money back if the shop scams them.

So - this whole system's lucratively is entirely predicated on easy credit and low risk meaning low fees. Anyone who wants to play in the mud that's leftover by these companies taking the good business are inherently playing a low margin risky game.