The game is based in a fictitious alternate universe and is largely influenced by Japanese wrestling, but WWE was upset with the game appearing in searches every time Michael Cole encouraged fans to download the official WWE app. This obviously generated more downloads for the game and it's not associated with WWE so it pissed them off and they had it removed.
At this time, the game is still available on iOS, where it has yet to surpass the popularity of WWE's official apps. The games creator, Mat Dickie, received the news on Christmas Day and was upset that WWE were not able to "show tolerance and respect" in this instance. He's got a good point!