I talk to myself, a lot. And I talk to others as well. How is this not a privacy concern? I also look sad, or look happy. I really don't want anyone to be able to sell me things based on the days I smile the most.
Do Teslas (or other cars) phone home and report where they've been? (DriveNow BMWs, which are technically rentals, do that, so they have that capability.) Have you driven anywhere where -- if you were to run for office -- you wouldn't want the public to know? Or, how would you change your behavior and places you visited if you knew you were "being watched"?