Game streaming is popular because of the personalities and explanations. Without narration, the vast majority of videogame clips are just cold and sterile, and not at all 'social'.

"Look at this cool thing I did" is the go-to example in this kind of demo, but in reality nobody cares. We want a human voice.

You don't think they'll capture the mic in multiplayer? That would surprise me.

Mic capture and narration is different.

?? Mic capture is all that's needed for the narration like what happens on twitch.tv.