> you're in a public place, other people could be taking pictures of you or writing down information about you, and I don't think most people are worried about

> you're in a public place, other people could be taking pictures of you or writing down information about you, and I don't think most people are worried about that either. The difference is scale. It would be prohibitively expensive for every pizza shop to hire someone to collect demographics of passerby. These systems can run on a Raspberry Pi.