No idea why you're being downvoted. The vast majority of today's games are literally designed from the ground up to be habit forming. They use timed random rewards in order to impose schedules on players. EA is of course a major offender, it's one of the reasons why they are universally hated.

The article essentially concludes that being rewarded feels good in the short term. What I'd like to see is long-term happiness and socioeconomic impact.