Which does fall down somewhat when the jackass going to a suicide forest is one of the biggest creators (estimated 4th highest paid in 2017) -and- was a Preferred Partner.
> means youtube has a chance to check the content
Sure but they apparently approved his suicide forest video.
https://www.polygon.com/2018/1/9/16869430/youtube-logan-paul...
"[...] YouTube moderation team had reviewed Paul’s video and deemed it acceptable."
No, the thing is advertisers do not want their brands associated with thing x. YouTube already has automated classifiers for demonetization. This is recognition that these classifiers do not work - from the side of advertisers.
Google could tell them "deal with it" and they'd probably oblige. The manual side was Google Preferred program.
That watershed moment is what caused YouTube to develop the whole demonetization algorithim in the first place
All of the above dread showing up next to eg some jackass going to a suicide forest and showing a dead person for kicks. Showing ads primarily against bigger videos means youtube has a chance to check the content. ie so-called brand safety.
See how the ad industry views the changes:
http://www.adweek.com/digital/youtube-is-finally-addressing-...