Spotify keeps users engaged by syncing music across devices and using smart...

https://future-wiki.win/index.php/The_Multi-Device_Shuffle:_Why_Your_Entertainment_Routine_Is_Actually_a_UX_Tug-of-War

Spotify keeps users engaged by syncing music across devices and using smart data to personalize every recommendation. They fold in gaming-style rewards and social features to make the app feel like a daily habit