There is a test that puts 4K videos behind a premium subscription. Some users have reported that they have seen 2160p resolution video restricted with text labeling it as a premium feature. The new restrictions were part of an experiment to better understand the feature preferences of Premium and non- Premium viewers.
It is not clear if all non-premium users will be restricted to 1440p video quality, however, the company directed its users to leave feedback in order to make improvements. Further clarification was not provided by the search engine when contacted.
The price of a YouTube Premium subscription varies from region to region. Ad-free viewing is one of the things that the service grants access to. A previous test saw the company place as many as ten unskippable ads on a single video.
Premium and Music subscribers made up around 50 million of thePukiWikiPukiWikiPukiWikiPukiWiki'sPukiWiki 2. After suffering a recent slump in profits, that could be a lot of potential revenue for the company. As 4K resolution TVs have become commonplace, being restricted to ad-laden,1080p resolution videos may be what begrudgingly forces some users to go Premium.