Youtube has declared a couple of restrictions on its Masthead ads to cut down the exposure & association with some type of content within the app.
“Beginning Monday, ads that feature any gambling-related content offline or online, including sports betting and casino games, will be banned. The ban will also apply to ads that promote the sale of alcohol, as well as branding ads for alcoholic beverages that don’t explicitly reference sales, while ads that endorse a candidate for office will also be banned. Ads that are political in nature, like issue ads, will be reviewed on a case-by-case basis.”
This change can shows the further shows the risk Youtube faces in gaining the reach to such 2 billion Users. But it would not impact the advertisers majority, Youtube has. It might considers as a compelling update in Youtube.