Team YouTube announced pleasant for content creators and bad for user innovation. This week some of the advertising videos will be displayed without the option to skip.
This feature began to be implemented for channels that have already can “monetize” your videos. At first it was available for selected channels as a pilot, and now applies to all participants of the YouTube Partnership program with the activated option of monetization. When the function ads without the option to skip starts on a certain channel, it is automatically activated and all previously uploaded videos.
According to the description in the support, the maximum length for ads without the option to skip is 15 to 20 seconds, depending on the region.