It's mostly VISA and Mastercard
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Started with Pornhub having to pull down every single video they hadn't personally vetted to be allowed to continue payments, and they continue to deny service to every single content hub that isn't safely adjacent to plain old vanilla porn. If there's something 'deviant' that grows big enough they'll slap a ban hammer on letting you process payments until you've succumbed to their requests to sanitize everything to their arbitrary standards. Patreon bent the knee to them a while ago, obviously. Pixiv had to wipe a massive amount of content a few years ago. Who knows when they'll come after SubscribeStar.