Targeting was super easy back in the days, when it was done based on where the ad appeared. Putting video game ads into a video game magazine and not diaper ads was kind of a no-brainer, but on the net I had to suffer through diaper ads on a video game site.
Not sure why we got to this point. If there had only been video game ads on my video game site I wouldn't have had to resort to adblocking back in - checks calendar - 2007.