I'm not too familiar with how Television ads work, but online advertising has a clear-cut billing model based on very dubious measurements.

When an advertiser decides they want to bid CPM or CPC they want impressions and clicks from real people, not bots, crawlers, mis-clicks, hidden ads that still count as an impression but is difficult for anyone to actually see, etc etc. Then there is the whole problem with view-based attribution - or attribution in general. The fact that a 1d view attribution is commonly accepted is ridiculous when you think about it, particularly in re-targeting.