The Youtube of China? The Netflix of China? The Hulu of China? Youku, China’s biggest web streaming video service defies simple description as it offers features that resemble all of the aforementioned services. Once a haven of piracy, now it’s a very deep library of user-generated content, licensed movies and TV shows, and its own original content. But it faces challenges from competitors as the video market consolidates and goes mobile at the same time.