I think the Dev got lucky. No one would have ever talked about this. The outrage proofs that all PR is good PR. The ppl that are most against this are the reason why this might become a success. Without their outrage only a few would have ever noticed this game.
There were a really good discussion in a german gaming board about the moral and social problems we face with games like this. Because we are fine with games like GTA or Prototype but complain about this. Or we dont care that we can kill millions of innocent beings on planets in a game like Stellaris, but only because they have no faces and are just some icons, we dont care.
Imho you should allow everything that is not promoting or encouraging harmful behavior in RL in games. Because games dont involve real ppl (unlike movies) to participate. I can easily split VR from reality and only because I can enjoy it in a game to slash a body into pieces, that is something that will make me puke by even seeing it on screen with real ppl (surgery video material i.e). It is the same with incest in these games. I could never think of my sister in a sexual way, but in a game that adds some extra spice. Even underage stuff (in games only, never should a real human participate in this even for acting) is fine for me in games - to certain degree - i.e in Parental Love I am fine with the youngest daughter for a game.