YouTube’s looking to help creators make more money from their content, by enacting automatic human reviews of its automated ad placement assessment in videos, in order to better catch any mistakes or errors.
As explained by YouTube:
“To improve the accuracy of our yellow icon decisions and get your videos monetizing faster, we are experimenting with automatically sending videos that receive a “Limited or no ads” rating for an additional review. This means that in some cases, we may review a newly uploaded video, even if visibility is set to private, and some monetization decisions may take up to 24 hours. We’re rolling this out to a small percentage of creators at first, but we’ll keep you posted on our plans to expand it to all creators that monetize with ads.”
Source: YouTube Will Now Manually Review More Videos for Ad Suitability