He removed Flappy Bird from the App store so that the media would publish headlines like this, increasing attention focused to his app. Then, he has two options: republish, or sell. If he republishes his app, the media will publish another story, increasing downloads. If he chooses to sell the app, he can probably find a buyer in the dozens of offers he is presumably receiving right now (in between death threats of course).
He removed Flappy Bird from the App store so that the media would publish headlines like this, increasing attention focused to his app. Then, he has two options: republish, or sell. If he republishes his app, the media will publish another story, increasing downloads. If he chooses to sell the app, he can probably find a buyer in the dozens of offers he is presumably receiving right now (in between death threats of course).