You can directly link into and share game states. I presume that a variety of interactive observer modes would also be fairly trivial to accomplish based on the

You can directly link into and share game states. I presume that a variety of interactive observer modes would also be fairly trivial to accomplish based on their architecture. This experience will be significantly different to normal YouTube and Twitch. It won't kill Twitch, but the viewing method will be different and likely eat into their market.