Why charge for airport WiFi?

I spend a portion of my time traveling for work. And I’ve got to tell you, there’s nothing more frustrating that picking up a WiFi signal, only to be rerouted to some landing page charging 30 cents a minute for connectivity. What compounds my frustration is how some airports choose to go the free route, while others charge like Scrooge. Can’t we, as advertisers, find a better way? Would you be open to seeing a few pre-roll ads, or answer a survey before you got your WiFi for free in an airport, or better yet, a bus station or public park?