with the news Gumroad is going to be cracking down on nsfw content due to payment processor pressure, reminder that itch.io is mostly known for games but explicitly allows books/zines/etc too and many nsfw creators swear by them as a host for their paid works. (with the caveat that they do limit this to nsfw content that is fictional, not eg irl porn work, among other content requirements; the full policy is here.)
itch.io is especially noteworthy because their approach to creator/platform split is incredibly flexible; you as the creator choose the split. you can in fact choose to take 100% and give itch.io nothing, only losing out on any payment processor fees. obviously itch does need people to choose to share some revenue with them to continue going, but if you as a creator need to retain your profits to keep going, you can set it wherever you like and itch honours that. and as itch has a culture of people choosing to set it above zero because the community wants to keep it going, if you need to reduce their cut, it's an option!
itch isn't as popular as a platform to share non-game works so promoting your stuff elsewhere is important for visibility. but as someone who regularly buys both comics and books off there, it is very, very viable. here is a basic 101 guide:
now: itch uses the same payment processors that prompted the gumroad changes, and may at some point be challenged on the same grounds. it's not inherently a safe haven. but itch.io has historically made its commitment to working to keep nsfw content viable on its platform clear (look up the epic store apple lawsuit nonsense sometime; it didn’t result in a nsfw ban despite everything) and as of now is still small and niche enough they are not getting challenged the way larger, more generally popular sites like gumroad are; they are not trying to be a big commercially viable site, just stable enough to keep trucking, so they are less likely to be subject to that much scrutiny, or cave to it.