It's because Visa got sued, lost, and it was found out they knowingly processed payments for illegal adult content, so they basically avoid the sector entirely now. Economist had an article about it maybe two years ago and came to much the same conclusion you did. IIRC, the failure in their mind was government not stepping in to make a law so things are less ambiguous in the future. Now payment processing cos get to gate keep people's speech, which means everything is basically a civil suit away from getting blacklisted.
>This week, US District Judge Cormac Carney of the US District Court of the Central District of California decided that there's reason to believe that Visa knowingly processed payments that allowed MindGeek to monetize "a substantial amount of child porn." To decide, the court wants to know much more about Visa's involvement, calling for more evidence of legal harms caused during a jurisdictional discovery process extended through December 30, 2022.
Seems rather weird that Visa out of all the parties involved got hit by this, that's like suing the national bank for printing cash currency that gets used in illegal ways? Or suing the pavement for allowing a heist getaway car to drive away. Or the gas station where they last filled it up.
