(it's me. i'm the friend)
On some point around or on December 18, 2012, AT&T uploaded a video to the "AT&T Archives" section of their AT&T Tech Channel.
The title of this video? The Benefits of a Regulated Monopoly. Yeah.
Unsurprisingly, this was made private pretty quickly. The primary reference I have to this is a random blog post from December 18, where the only comment is the blogger talking about it being taken down that evening.
There was another video called The MacKnell Quandary, which seemed to tackle the same subject. This is interesting, but not what I'm looking for. Although, if you end up finding it, I'd be interested—it was up for almost a year, so it seems, and taken down around the same time. But it's more of an illustrated slideshow, whereas the other video I'm referring to was animated and full-color.
I've spent years on-and-off trying to look for this, and I'm pretty sure it's not available on any obvious part of the internet. The Internet Archive only started archiving the YouTube page on December 22, which is too late. Nothing on Google, DuckDuckGo, or Marginalia search. At this point I'm at a loss.
So if, for some reason, you or someone you know has a copy of this video just kicking around on a hard drive/floppy disk/ZIP disk somewhere and would be willing to upload it to some corner of the internet, I would be very interested!