Robin MorningWood also let you pick a position at the beginning, but it does not matter. The game also leans toward player sub since many of the love interests, even vers ones, are dominant. There is also a whole dungeon dedicated to player sub content.
I remember we chatted a while ago when you posted a discussion about top / bottom content, like this one, a few months earlier. There are currently more bara games catered toward bottom players than top players, which makes it even more important for the devs to indicate where their game is leaning, like OIHS did, so the players know what to expect
I think most creators of gay erotic games that lean heavily towards the sub or bottom audience don't even realize that it's an issue that needs addressing. I don't want to assume things, but I wouldn't be surprised if they thought it didn't matter whether the MC can top or bottom. That's the purpose of this article, making it clear that it is an issue. That's the first step in solving a problem, making people aware it exists in the first place. But yes, there seems to be more bottom content than top content in gay games and I can't tell you why. I know a lot of gay artists who cater towards tops, so maybe it's just a case unique to writing?