https://www.theverge.com/2018/6/27/17510866/youtube-picture-in-picture-android-free-rolling-out-premium > YouTube is expanding picture-in-picture mode to all users on Android today, whether or not they’re paying subscribers to YouTube Premium, as first spotted by XDA Developers and confirmed by Google’s support page. > The feature — which Google started testing for free customers earlier this year in May — lets users on Android O devices watch YouTube videos with Android O’s picture-in-picture mode, without having to pay for a YouTube Premium subscription.