Come on, think about it seriously. They probably already knew their idea was very good or else they wouldn't be working that hard on it. Google's joining their

Come on, think about it seriously. They probably already knew their idea was very good or else they wouldn't be working that hard on it. Google's joining their market does not provide them much information. However, the odds of them being killed be a competitor probably increase by more than a factor of ten from the world where Google was not copying their core feature.