Earlier quoted context omitted.
Well, do you have proof that Google/Apple/Nokia/etc. isn't already doing that with your phone? If you're going to be super distrustful of closed source stuff by companies with an interest in gathering user data and assume guilt before innocence is proven, that's fine. But you can't do it selectively!
The incentives for Apple to do this are relatively minimal and Google has a track record of hoovering up information on you to target advertising. Almost as if it’s their entire business...
Heck, Face ID is the perfect ad technology. They can charge based on attentiveness now.