The mysterious developer of the world’s most popular free app, who drew global attention this past weekend with his sudden decision to remove it, tells Forbes that Flappy Bird is dead. Permanently. “Flappy Bird was designed to play in a few minutes when you are relaxed,” says Dong Nguyen, in an exclusive interview, his first since he pulled the plug on the app. “But it happened to become an addictive product. I think it has become a problem. To solve that problem, it’s best to take down Flappy Bird. It’s gone forever.” In killing Flappy Bird for what he maintains are altruistic reasons, Nguyen is walking away from a jackpot. An article in the Verge last week estimated his daily take from in-app advertising at $50,000. Nguyen declined to confirm that number. “I don’t know the exact figure, but I do know it’s a lot.”