The laws you talk about are, I think, laws about stalking. I'm not aware of any laws that apply to that kind of thing if it happens on a massive scale. Singling

The laws you talk about are, I think, laws about stalking. I'm not aware of any laws that apply to that kind of thing if it happens on a massive scale. Singling someone out is an important part of stalking. Keeping detailed information about everyone that enters your store isn't illegal, as far as I know. Especially not information that is gained from observation (what color shirt they're wearing, their IP address) and information that is submitted willingly (their name given for a reservation at a restaurant, their username).