I’m certain it’s possible to obscure your face beyond the ability of any machine to recognize it. At that point your enemy is gait analysis, but there are countermeasures for that as well. As for utterly pervasive surveillance that is so redundant and automated that the government can know anything about anyone, anywhere, retroactively…. I don’t know if we are there yet. I’m not going to spend too much energy worrying about the prospects of Chinese pirates.