Self-link: I wrote about this excellent study in my recent book critiquing gamification, You’ve Been Played: https://www.basicbooks.com/titles/adrian-hon/youve-been-play...

Gamification is significantly more widespread and influential than commonly thought. We’re aware of it in our own corners of life and work, but less aware of how it’s being used on, e.g., truck drivers, gig economy workers, school students, video game players, and more.