The Avengers Movie Is Brought to You by the Letter A

Looks like that SDCC Avengers movie teaser popped out last night. As every report said, it contains nothing but some Sam Jackson narration and a big “A.” There’s really nothing to discuss about the teaser itself, but get this — Marvel has spent the night getting YouTube to pull down all the copies of this thing they can find (people keep uploading it again, natch). My question is this: Why? Who cares? What is Marvel concerned about? Is there a problem with the narration that Marvel doesn’t want people to hear? Is it the “A”? What could possibly be the reason they’re removing this utterly uninformative video down, other than sheer peevishness?