In the recent years, you would have noticed a lot of ads are being played while watching videos on YouTube. People upload content on to YouTube and make money by running ads through YouTube Partner Program (YPP) when you watch these videos. YouTube shares some part of their revenue that is generated from their Advertisers with the content Creators when the ads are played.
A lot of inappropriate content including hate videos and child-exploiting clips is being published on to YouTube in the recent years to take advantage of the monetization. Advertisers are worried about their brand safety as they found their ads next to the objectionable content.
Stricter criteria for monetization on YouTube
After careful consideration and conversations with Creators and Advertisers, YouTube is making big changes to the process that determines which channels can play ads. In 2017, YouTube has mandated that a channel had to reach 10,000 total views to be eligible for monetizing. Starting from today, any new channel wants to run ads on their videos needs to have 1,000 subscribers and 4,000 hours of watch time within past 12 months. The same will be applied to existing channels beginning 20th February 2018.
Size alone is not enough to determine whether a channel is suitable for advertising. YouTube will closely monitor signals like community strikes, spam, and other abuse flags to ensure they comply with the policies. Both new and existing YPP channels will be automatically evaluated under this strict criteria and if found that a channel repeatedly or egregiously violates YouTube community guidelines, the channel will be removed from YPP.
Manually reviewing Google Preferred
Moving forward, the channels included in Google Preferred will be manually reviewed and ads will only run on videos that have been verified to meet the ad-friendly guidelines. It is expected to complete manual reviews of Google Preferred channels and videos by mid-February in the U.S. and by the end of March in all other markets where Google Preferred is offered.
Source: Google AdWords Blog