[scythe]

Payments aren't where you catch those people anyway. If you know someone is selling child porn, you don't just refuse them from your payment network, you call the cops. Alternatively, if you want to sell child porn, you set up a shop selling t-shirts on Etsy for $50 apiece, and use that as your payment back-channel. Payment providers are only effective in stopping porn when it is sold as porn; they lack the investigational capacity to deal with porn that is sold as something else.

I simply don't think that CC provider restrictions are a good way to deal with CSAM in the first place, basically.