Polygon: This morning I went to install Swing Copters, Dong Nguyen's latest iOS game, and the follow-up to Flappy Bird. I put the words "swing copters" into the search field on my iPhone, and the first hit was Tube Revenge - Swing Copters.
This is how quickly individuals and companies now jump on games they want to clone. The idea is to get their version of the game out as soon as possible, and then try to piggyback on the success of the "real" game. They just need to backwards engineer something that looks a tiny bit like it, get the name close, and then release their product. If enough people are confused, the revenue from ads or even in-app purchases apparently makes it worth it.
It's worse on other platforms.