Both GoG and itch.io are considerations! I heard that GOG is working on an adult section (or might have launched it already) ^^
I use itch.io ;3
Well, GoG does have some adult games. But honestly, I don't care if you release on GoG or Itch, I just don't do Steam, so either one of them (Gog or Itch) is perfect for me and it will be worth $ 4,50 or more on Patreon! :)
I agree Itch and GoG are good fur me too! Steam just gives me bad vibes these days.