Agree, funny how most comments focus on the money aspect of the conversation. He wanted to feel socially responsible again, did not like the impact that his game had on people's psyche / addictive behaviors and pulled the plug because of it.
In fairness, the three games he's currently working on follow that same mold of being super easy to learn and super hard to beat--not a good recipe for warding off addiction!
You have a point there. The article states he wants to introduce reminders to take a break, though that sounds like the usual excuse feature in such cases.