Itch.io is currently saying the problem is Stripe, and maybe Visa.

Historically (ex: https://otakuusamagazine.com/visa-and-mastercard-refuse-to-work-with-another-doujinshi-retailer/), I’d say Mastercard and Visa are both to blame. But the jury is still out on wtf is going on here.

I’m not sure who pressured Steam. But Itch.io (https://aftermath.site/steam-itch-porn-censorship-collective-shout-visa-mastercard-paypal) is claiming Stripe and Visa are pressuring them.

(Speaking with Aftermath, Itch’s founder, Leaf Corcoran, specifically cited a notice from Visa as an incident that led to the sudden deindexing of so many games).

Discover and Diners Club merged a few years ago btw. Discover also has an alliance with JCB.

So Discover network is actually really, really big.