Ads on mobile is going to be a marginal business compared to the web. Screen real estate is at an absolute premium, alternative revenue models exist (such as ch

Ads on mobile is going to be a marginal business compared to the web. Screen real estate is at an absolute premium, alternative revenue models exist (such as charging your users directly), and there's a high barrier to any call to action (such as signing up to your service on a mobile keyboard). I doubt that any ad network will gain the traction to dominate the space.