There's at least one potentially positive use of that. In an ideal world, broadcasters would use this data to become aware of which ads are so loathsome that t

There's at least one potentially positive use of that. In an ideal world, broadcasters would use this data to become aware of which ads are so loathsome that they drive away viewers. Ad revenue is a win. But if a particular ad (more than others) causes people to leave the room or change channels, the following ads will get less views, and that could be a loss. If you actually know when that happens, you could charge advertisers extra if their commercials are too annoying. Or just not even air those ads.