I think this arises because we can't really model intentions as they involve irrational, subjective, qualitative preferences. .. That's to say, I completely agree with you.
Did anyone ask for; "What did you think of this video?" 5-star feature, or "Recent Posts" ie. "Hi guys, i know i haven't done a video recently blah blah".
It appears they are repeating the same mistakes made on G+.
I'd assume that data is being used for training somewhere.