In a blog, YouTube mentioned that ads can now appear on videos from channels not in the YouTube Partner Program (YPP), and it will begin gradually placing ads on brand-safe videos. This will help advertisers responsibly tap into the full scale of YouTube to connect with their audiences and grow their businesses. For the channels that are not in YPP, there will be no revenue share on ads, but creators can still apply to YPP.

Also read: Audio Ads can be run on YouTube Videos

To be a part of YouTube’s Partner Program, creators need to have over 1,000 subscribers and  4,000 hours of total watch time in the last 12 months. YouTube creators who meet these eligibility criteria can apply to monetize their videos.

For more information in this regard, YouTube creators can refer to https://www.youtube.com/t/terms