@TeamYouTube If YouTube is aware that I’ve watched a video (Indicated by the red line at the bottom of the thumbnail) why is it still being recommended to me? (I use mobile)
While we can't share specifics, recommendations are also influenced by your search & watch history. If you haven't already, try marking the videos as Not interested > Tell us why > I've already watched the video. Learn more here: https://yt.be/help/cJiM . Hope this helps.