Comment by logifail

> These are all the things a restourant owner would know about their customers, for example

The restaurant I visit most often "knows" only my first name (only) plus my mobile phone number, I suppose if they really tried they could probably collect data on my approximate height, build, eye and hair colour, and that I have multiple kids. That's it (since I pay them in cash).

Oddly enough they don't worrying about tracking their customers and instead focus on delivering an excellent product with excellent service. They're known in the region for that, they're usually busy, so one might think their strategy seems to be working(?)