I honestly doubt you can fund an entire game just by that. I personally don't mind real life ads in a game as long as it fits the game world. Example seeing an ad for a car brand in Gran Turismo or Forza is fine, but having something like a McDonalds ad in either game is just weird.
Or for example having a McDonalds ad in a GTA game to make the world feel more alive and to make it feel as real as possible.
But yeah, as for being able to fund an entire game with ads I guess would depend on what type of budget the game has. However I still think even with a low budget, it's highly unlikely.







