While I do see this being an excellent acquisition for YouTube if true, I do agree. I don't see how YouTube could reconcile it's copyright stance with how Twitch fundamentally works.
It's a smart move for Google.
So whether it be for removing a competitor and/or entering a new market, my point is I think a company like Google would have considered copyright issues before doing something like this.
And maybe Elephants will sprout rocket jets and fly into the dark side of Pluto.