Netflix knows everything you watch. Every show you start and abandon after one episode. Every movie you pause to check your phone. Exactly how long you spend browsing before choosing something. All of this data gets collected, analyzed and shared with third parties.
Most people assume their streaming habits are private. They aren't. While Netflix tracks your behavior to improve recommendations, it also shares that data with outside partners for advertising and analytics. Unless you explicitly opt out, your watch history is being distributed by default.