Privacy

we always need a machine to do it.

That's the point. Recognizing a car; stairs; busses; motorcycles; stoplights; we used to be the only ones who were able to do this, but now LLMs can likely do them better and faster than we can.

But QR codes have always been deciphered by machines, so how would me using a machine to scan the QR prove my humanity? It just shows there's a phone with my ID on it. It's just 2FA, not are-you-human.