Uuuhhh I’m gonna need a bit more citation on that “it’s an app store thing” statement, considering you can download Radish on the Apple Store, which is a popular app-only erotica platform (and yes there’s queer stuff there too)… and Alpha/Omega is a predictably popular theme.
Only thing I can think of is you do set the age level your app is appropriate for, so perhaps if you want it to be lower than 17+, the restrictions are a lot more harsh. But considering it’s tied to parental controls, I’m… not surprised?