Over the span of any given Monday you likely interact with at least three different recommender systems. If you’re like me and actively avoid most forms of social media, you might still scroll X (“it’s for learning!”) as you wait for your coffee, put on a Spotify daily mix at the gym, and let YouTube play a recommended Tiny Desk as you make dinner. If you also use TikTok, Instagram, and Netflix on an average Monday, you’ve just doubled your recommender system exposure for the day.