Best thing about government going extreme on face mask enforcement is they're going to have a hard time abolishing the new cultural norm when they want their precious facial recognition back.
Are you required to keep your tracking device on you at all times? What if you don't have a phone capable of supporting the app? What if your pocket is a faraday cage? What if you have multiple phones and you only install it on one of them?
Oops left my phone at home/in car.
Oh it died and is charging at home/in car.
I'm so broke I don't have as by data on my phone, it's at home where I have wifi.
Etc.