Earlier quoted context omitted.
It's kind of ironic to be using a device made to display advertising to combat advertising itself.
Digital signage isn’t really about advertising. It might be used to eg show departures at an airport/bus station, or show schedules for different rooms at a conference or fair/exhibition/show. Other common uses are to show a few slides on a loop, eg in a reception area of a school showing the school’s achievements.
Some network operators run 3rd party advertising to offset costs of running their network.
Also, if you see a sign at person level in a public space there's a high likelihood it's collecting demographics information on (age, gender, ethnicity - via video image processing) on everyone passing by while also trying to identity the mobile device in your pocket to geotag your advertising identity.
I work in a company that provides general interest "filler" type content for networks to display - news, weather, sports e.g.