YouTube is trialling a new anti-adblocker popup that features a timer warning when the next advert will play. Viewers can then choose to either “Allow YouTube Ads” or “Try YouTube Premium”. Right now, the warning is being served to select groups of people around the world that have ad blockers enabled. "We take disabling playback very seriously, and will only disable playback if viewers ignore repeated requests to allow ads on YouTube." For more information on YouTube's ad policy, you can visit the YouTube Advertising hub.