I'm not a data scientist nor a psychologist nor an addiction expert nor ...
But I've played some games. I am 137% confident that some form of "level up" (roguelikes, MMOs, MOBAs, FTL) is an extremely strong addiction factor. League of Legends, that free game whose net worth is among the highest of all time.
In real life, you study->grades->job->promote->takeoverworld. Or liftweights->liftmoreweights->liftmoreweights. Or climbmountain->climbhighermountain...
In games, you do that in 1/100 the time and effort. Tap a few buttons and "you win!!!!"
A sweeping statement to the effect of "people don't understand addiction" is basically malicious and I accuse you of being the inventor of gamification or one of their PR folk.