Youtube business model is to make money of playing ads to it's viewers. Recent changes to Terms of Service allows Youtube to inject ads to content that has non

Youtube business model is to make money of playing ads to it's viewers. Recent changes to Terms of Service allows Youtube to inject ads to content that has none. Before kids get to their assigned video they have to often watch an ad for a game or a service. Sometimes multiple ads play throughout. Also, at the end of the video kids get enticed to watch more videos that Youtube wants them to see (not the teacher or parent) - in order to play more ads.