When you browse Netflix, they use different thumbnails for the movies depending on the profile they’ve made for you. Even if it’s as blatant as “white person from the movie”/“black person from the movie”. If you ignore a movie for long enough, sometimes they even swap it out for a different image to trick you into watching it.
I’m amazed that YouTube doesn’t try and do this somehow. Instead, every video somehow has the same stupid thumbnails of arrows, meaningless text and gormless faces, and I hate it.
But then I block all ads anyway, so it may be that they’re actively trying to make me go away.