Why can't they stream it on YouTube everyone else? Give up on QuickTime; it's dead.
Your opinion that QuickTime being dead is contrary to the fact of how many iPhones, iPads, Macs and Windows machines have the necessary software installed to play back these streams.
I'll flip your question around - why can't everyone else use HTTP Live Streaming, given that Apple has released all the specs on how to produce and consume the streams and that it uses existing standards like h.264 video and AAC audio that even YouTube uses? Why should they have to tie themselves to a proprietary service like YouTube? There is nothing stopping Google from implementing HTTP Live Streaming in Android -- other than their own corporate goals.