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?