Because you will be paying in some other way, for instance because your data is sold out the backdoor. Ryan J Shaw always orders from these two addresses, that means he's probably living there, he orders a lot of fancy food so we can enrich his profile and sell it to the highest bidder. Any app that you install should be reviewed as to what permissions it requires and you should be very careful with anything that wants to have your location, especially if it is on a regular basis. And location is something that can be inferred from many things, that QR code that you just scanned doesn't look like it is location data but it may have location attached to it which gets recovered when you scan it. So completely invisible to you you just allowed your lat/long pair+timestamp to be sent to a bunch of servers outside of your control, and with a bit of luck with your device ID or other identifying info added to it. As well as which cell phone provider you are using, what make and model phone you've got etc.