As I understand it, private and unlisted videos are often used as a draft mode for videos that eventually become public. Uploaders want to check everything, mak

As I understand it, private and unlisted videos are often used as a draft mode for videos that eventually become public. Uploaders want to check everything, make sure all the transcoding is done, etc before flipping a video to public. Additionally, unlisted videos are sometimes used to run ads. This way, the ads can be played on YouTube without being listed on the advertiser's channel.