When you generate real-time video of realistic-looking talking characters, the definition of success is fooling people into believing they are talking to a real person when they aren't.
If you pursue this, your explicit goal is deception, and it's a massively harmful kind of deception. I don't see how you can claim to be operating ethically here if that's your goal.
If you pursue this, your explicit goal is deception, and it's a massively harmful kind of deception. I don't see how you can claim to be operating ethically here if that's your goal.