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Mastercard and Visa face backlash after hundreds of adult games removed from online stores Steam and Itch.io
(www.theguardian.com)
This is a most excellent place for technology news and articles.
Visa also have a fairly well documented history of kowtowing to Christian groups. The CEO of their Asian division is a right-wing religious fanatic who hates, well he's a religious fanatic so you know what he hates, but it's basically everything and everybody.
They don't like Japanese anime very much as well, probably because they think it's all pornography (anime does tend to have that bent, but it's not all pornography).
The thing is on their website they claim not to make moral judgements about purchasers, they claim to authorise anything that isn't actually illegal, so they should be totally fine with pornography and anime. If they are going to be right-wing religious fundamentalists at least they could be honest about it on their website.