The old adage that "what you don't know can't hurt you" refers only to problems of the mind. For all that I do believe you have no expectation of privacy in public, I believe that enables undirected actions, like you being photographed in the back of someone's photo, or even some amount of directed action, like someone taking a picture of you because you look funny and they're gonna laugh at you. I do believe that omnidirectional actions like "Have map of what everyone is doing in the public space" are actually quite different and open for debate.

I don't have a problem with this technology being applied at Amazon Go stores - a specific contract exists between you and Amazon that they're tracking you inside their private space. I don't have a problem with Walmart installing the same technology, but I would choose not to patronize Walmart because of it. I do have a problem with Walmart installing it looking out onto the street and then selling the data to anyone who wants to know positions of passerbys in New York.

Ultimately, there is some power imbalance here, and technology should act as agents for humanity, not as it's overlord.