Numerous "family friendly" advertisers have ceased spending on Youtube after the fact numerous Youtube users had been using videos featuring children as a sort of "soft core" child porn, this is in contrast to the "hard core" child porn produced and consumed by US "law enforcement" (archived). Apparently someone pointed out to Disney and Nestle that their ads were appearing with content that showed children "compromising positions" to the adoration of the Youtube commenter community.
This happens to coincide with Youtube moving to demote popular content they describe as politically "questionable", something they have not done with content softly sexualizing small children.