'If you don't like it, I guess we gotta rip down Michelangelo's David, because that's absolutely NSFW.' <- 'In 1857, Pope Pius IX ordered a large-scale mutilation of penises in the Vatican. Hundreds of sculptures were castrated and covered with plaster or bronze fig leaves. This act was part of an effort to censor nudity in art and reflected the strict morality imposed by the Church at that time.' I did a copy/paste, sorry, but it really remembered me that case.
It looks like the case above but pushed by a group of radical feminists in Australia named 'Collective shout'
There is not much to do, that depends. If i had to move my games to somewhere else. first I will buy a HDD of 1 or 2 Tb to save all my games and stuff (a local backup). Second, i would start searching for a way to start my own webpage, i would search someone i could afford and is more 'free' in terms of what i could and could not upload and set up a alternative payment system that's not under the influence of Collective shout or, simply set it up in Bitcoin. But this one doesn't guarantee sellings because many people is not fond of cryptocurrencies or have a hard time getting use to it or simply acquiring it.
Sadly there is no 'right answer' as 'i'm going to X,Y,Z place now' Because the problem is with both worldwide payment processors (as far as i know, i might be wrong). I don't know if Payoneer, paypal or American Express doesn't apply to Collective shout's demands, but nothing guarantee they wouldn't eventually be used as part of this massive censorship.
By the way: 'I'm also naive enough to try and post my games in itch' <- You are not naive. You did basically what everybody does. Itch.io is a great place to share games,artwork,etc. The problem is not itch or steam or nintendo, the problem is with the payment processors.