Spotify keeps us hooked by blending smart personalization with community...

https://technivorz.com/why-do-push-notifications-pull-me-back-into-apps-and-how-theyre-engineered-to-do-it/

Spotify keeps us hooked by blending smart personalization with community features. They use analytics to suggest what we actually enjoy, while gaming mechanics and cross-device sync make the experience feel seamless