Imo, the whole YouTube thing is "meant" to be amateur-ish. Now what has sprouted from that tho are some comercial things, even whole shows taken from tv/video.
IF the YouTube limit the video size, I would prefer them to be free-and-easy amateur style.
I`d rather copyright things wouldn`t be an issue, but I do think that perhaps if some company does have some sense of violation that they could tagg the said video and it can be removed.
I thought that happened anyway for illicet stuff.
I`m not an avid YouTube fanatic, but I do respect what it is.