I've already seen this in Michigan. A local restaurant had a sign with a QR code on a standard next to the hostess station. They demanded we ping the QR code with our phone to "check in", for contact tracing. I refused. They said do it or no entry. I spun on my heel and left. Bastards.

It occurred to me later I should have just said i don't have a cell phone, but I don't lie that easily. Also, a place that does that? Screw 'em!