Twitch CEO Dan Clancy wants to hang on to the live-streaming crown

Back when I first started covering the internet, the idea of broadcasting yourself for hours on end seemed like a pipe dream for weirdos. Now it's how some people make a living. Twitch more or less created live-streaming in the U.S., which is why Amazon bought it for about $1 billion back in 2014. But now there are plenty of places to watch, and create, live streams. How does Twitch fend off competitors? How does it convince its most popular streamers to keep streaming? And how will Amazon event...