[jordhy]

We are building an app for that, it's called Bitfari. It pays people to disclose preferences and customizes city ads as they go about their day. It also blocks ads the majority of people don't want to see and routes them to different locations, so that public ad space is better allocated. The service has integrated over 200K screens globally and its currently valued at 25M+. You can learn more about it here https://bitfari.org/whitepaper/