Why did they take the Unobtanium video down on youtube?

Or make it private.
I can't believe they did that, the video was very nice.
They may have made it private because they wanted to change to an Unobtanium only Youtube account. The current account the video was on has the real life name of the developer, so he may have wanted to give his life some privacy by making a new account, unassociated with his real life, and putting the Unobtanium video on there.