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The inventor had it removed.
It had a lot controversy since a lot of their concepts came from previous games. It gave the owner a lot of trouble and legal actions were taken. There are a lot of games like flappy bird that have the same concept but have not become as popular.
Flappy Bird was made popular by ranking high in the app store. There is some argument about how it became so popular (whether or not the creator paid for ratings and downloads to boost the game's rank on the store). It exploded in popularity even further once he announced he was going to remove the game from the app store. Pewdiepie also gave it a lot of popularity.
Your game shuts down when someone (usually the Admins or the Owner) decide to shut it down for what ever reason they though fit. Also there are scripts that can shut it down or people can hack and shut it down.
It was temporarily shut down to protest SOPA and PIPA.