itch.io is beginning to re-index NSFW material. In an update on itch today, site creator leafo says to be considered you have to turn on "no payments," meaning you can offer NSFW content freely, but you can not sell it on itch.io.
He also says he spoke with one of their payment processors, Stripe, who said they will not process "content designed for sexual gratification". He passed along a quote from Stripe:
Stripe is currently unable to support sexually explicit content due to restrictions placed on them by their banking partners, despite card networks generally supporting adult content (with the appropriate registrations). Stripe has indicated that they hope to be able to support adult content in the future.
Leafo says itch is also in talks with other payment processors, hoping they will be able to process payments for that material. They're also working on a new content warning system. You can read a good story on everything thus far at GameIndustry.biz.
In other payment processor restriction news, GamingOnLinux points out MasterCard says "it wasn't me". To pull the quote that they did, in a statement MasterCard includes:
Mastercard has not evaluated any game or required restrictions of any activity on game creator sites and platforms, contrary to media reports and allegations.
Our payment network follows standards based on the rule of law. Put simply, we allow all lawful purchases on our network. At the same time, we require merchants to have appropriate controls to ensure Mastercard cards cannot be used for unlawful purchases, including illegal adult content.