For quite sometime Google has been turning ads off on youtube content they deem to be inappropriate. This is done automatically without contacting the youtube content creator, and there is no explanation of what exactly triggered youtube's algorithm in the video to have ads rejected based on family friendliness. The most command triggers are any type of foul language, and mentions of violence, or sex. Youtube has gone as far as cancelling the youtube red show, as well as removing ads from content of Felix Jones (aka PewDiePie) for inappropriate jokes.
Apparently the algorithm isn't doing a good enough job. Verizon and AT&T along with many other companies have decided to totally pull their ads from all non search Google platforms. This decision comes after Google found out their ads were being placed next to content that promoted hate speech and terrorism. Both companies will continue this stance until Google is able to guarantee that their products won't be placed beside questionable content. It looks like Google is going to get a bit more strict. Will Google eventually take away partnerships and just allow ads on a handful of curated content? It has been known for a while that Google gets 90% of revenue from the top 1% of creators. They could easily dismiss 99% of the channels on youtube and not really miss a beat.
via Recode