I've seen a lot of games having problems with incest hate/controversy in recent years, which is why Lewd Patcher is full of incest patches. I feel like for some game developers, futa and/or trans games have become a new opportunity to create fetish games without the need for censoring it like some incest games do (I always find it really weird when games start using the word housemates).
While there are different reasons why people would seek different types of fetish content, some people only want things outside of the norm, and for them, futa/trans games are an alternative that might become easier to come by than incest games.