Good analysis from David Farrington on the hysteria over Face ID:
The thing to understand about Face ID is the same thing to understand about Touch ID. Your face gets scanned but not captured. What is captured is enough data that gets saved and then compared to the next Face ID or Touch ID scan which then determines whether or not to let you use the iPhone.
What about Animoji?
There is no image of your face in Face ID. With Animoji in Messages and with Apple’s developer access to some of the TrueDepth camera and sensor API’s which can produce facial expressions, all that gets captured and used is a facial expression and movement that is not identifiable as coming from your face.
End of discussion? Probably not.