I wouldn't suggest you listen to them blindly, but you're crazy if you think YouTube didn't ask actual attorneys for a risk assessment (their VCs would have required that). They certainly didn't ask a bunch of hackers.

For those who've never heard of this gem :)

Well, I don't know as I want a lawyer to tell me what I cannot do. I hire him to tell how to do what I want to do. ~ J. P. Morgan

haha :)