They have (finally) snuck in to North American life, but it would still be unusual to see them on a billboard here. I find it interesting that most use cases in America involve transmitting information from a phone, rather than to it: boarding passes, event tickets, Amazon Prime codes at Whole Foods.

The only exception I can think of off-hand where scanning the codes on a phone is common here is scooter rentals. I doubt the average person on the street here would know how to scan a QR code they encountered in the wild (as opposed to app-specific codes).