this is the same stupid reaction that came out of the myspace legal bullshit, regarding the content posted and the licenses and sub licenses etc etc.
The key thing is that for people who don't know about digital content, you have to have clauses like that to ensure the legal copying of content from servers to servers, and even cache on a user's browser. If someone viewing the content can save it, then sub licenses have to be granted as well. the video link leaves out half of each paragraph that it is quoting... for example :

"You may remove your User Content from the Site at any time. If you choose to remove your User Content, the license granted above will automatically expire, however you acknowledge that the Company may retain archived copies of your User Content."