"Opting out" means everything takes longer & they physically molest you every time, so given that the cost & personal violations increase, there is no real way to opt out. And there is like a 110% chance that face tracking is still being used via security cameras anyway so you are just being doubly punished for some false sense of "I'm not in their database." You walk through an airport, & probably a Bank of America, or any other politically connected corp monstrosity, you're being IDed & tracked.