Sure, they were done, but not nearly as effective - hence all the effort to gather data for targeted ads. If you want completely integrated ads you'll need abo

Sure, they were done, but not nearly as effective - hence all the effort to gather data for targeted ads. If you want completely integrated ads you'll need about twice as many to get the same revenue. And I'm not even sure what's so terrible about targeted ads in the first place (leaving aside how the data is handled which varies enormously).