From the uncanny valley Wikipedia page:

In aesthetics, the uncanny valley is a hypothesized relationship between the degree of an object’s resemblance to a human being and the emotional response to such an object. The concept suggests that humanoid objects which imperfectly resemble actual human beings provoke uncanny or strangely familiar feelings of eeriness and revulsion in observers.

In a nutshell, fake people that are close to real, but still clearly fake, are creepy.

Watch the video embedded below. This is remarkable work. For me at least, the uncanny valley has been crossed. But that said, this terrifies me as much as it fascinates. Yet another sign of the deepfakes to come.