I feel like steam is gonna follow itch soon so I'm just wondering if there are any alternatives.
OMG - you have not been reading anything before you posted this either on this site or in the news out in the real world, have you? There are over a dozen threads on this site alone discussing the itch/steam situation that were started about 2 weeks ago.
Itch is still offering adult games - just certain content is being removed to abide by their own rules that have been on the books for 10+ years, including the rules of their payment processors.
Steam already started removing games with similar content about 2 weeks ago - but still offers adult games, as well.
Patreon did this 8 years ago - and still hosts over 9,000 adult game developers.
Gumroad, Pixiv, others have all done similar.
Subscribestar has similar rules as Itch, Patreon, Steam, Gumroad, etc - (in fact, they have one even more stringent rule) - but haven't been enforcing their rules... yet. But they will still host adult game developers.