outbid3d.lol is a leaderboard you can walk through. Every screen in the city is an ad slot, and the only thing that decides who gets which screen is what they paid. No ads network, no accounts, no revenue share.
There are 300 physical screens, and they are deliberately not equal. #1 is the plaza jumbotron everybody sees on load. #80 is a poster you only catch if you walk past it. That gap is the whole product.