maybe because of this: Requirements for ads on embedded videos Ads appear on brand safe sites: YouTube works diligently so that our advertisers' brands a

maybe because of this: Requirements for ads on embedded videos Ads appear on brand safe sites: YouTube works diligently so that our advertisers' brands appear on sites that reflect our respective core values. Our systems closely evaluate websites and their content against various factors when finding out whether to turn on In-stream ads on YouTube embeds Maybe they can't evaluate local files