Well said.
I do not like most horror games here, because of low effort. Putting in gore and shock elements is just very easy, so indie devs can put that in, with little budget and skill, I believe that is a big part of the reason why there are so many horror games here.
The reason I asked about Steam, is because Steam is the biggest fish for game publishing on PC. If you look at AAA releases, you might see their logo beneath the title alongside Playstation and Xbox. Some other stores do not sell games directly, but sell Steam keys to those games. Maybe in other regions other stores are more popular.
See here (you need to click satellite view for better information) https://store.steampowered.com/stats/content/
Well, and this biggest fish does do publish those indie adult creators of cartoon nsfw stuff.
And Patreon is the most popular crowdfunding subscription service. It fits well with the pay what you want method so favored on itch. You might have seen Youtubers and other influencers promoting their "patreon". They also have nsfw cartoon stuff.