So I have a bit of advice for the dev. If you keep using the faces of famous people, you will probably wind up facing legal repercussions.
You can't just generate their faces in a program and start using them to make money, because their faces are arguably what they use to make money. That would be like if I started 3d printing the fiberglass frames of an Aston Martin car and started selling them online. You are using their assets without their permission.
Not to mention that as public figures, they have a public image to uphold. They 100% have the power to send you a cease and desist letter to make you stop what you're doing because their public image is being smeared by the game. Finally, it's just fucking weird alright? At the very least ask them and make sure they are fine with their faces being used like that, because I sure as fuck wouldn't.