What same treatment would that be? The movie is available in the US. Are credit card companies and stores being bullied for accepting payments for that movie too?
That movie is a horror shocker movie which aims to disturb. It's distribution is "banned" in many countries. Germany is famous for doing such things and they now have it categorized in the same category in which also all porn is: forbidden to advertise. It previously was forbidden to sell. A sales place could not legally sell you a disc with the movie on it. It would have been a crime.
The game is a run of the mill incest porn game with artificial pictures and a dose of non con/blackmail. The aforementioned strict Germany would not have a problem with the game. Can't sell it to minors, but that's it. It is fiction and even depiction of minors would be ok in the game, as long as they do not look like real people. The game was approved on Steam, and Steam is known to have a high entry bar. The developers overdid their marketing on that angle and got backlash. A lot of it. To the point where people would call it a rape simulator and rile up the angry mob with a lot of false claims and false evidence and the usual fallacious arguments and non arguments against games, that I lamented so often in this thread.