You must have applied a selective filter:
»www.comcast.com/Corporate/Custom ··· AUP.html
use the Service for any purpose other than personal and non-commercial residential use (except for your individual use for telecommuting);
Note: I used to negotiate large commercial contracts and let me assure you that for it to be a commercial line that you would have to serve (UL) commercial content for it to be considered commercial business, AND it would have to be in a regulated industry (not non profit and the like). Initiating a VPN to you company (note you are initiating) to do work at home is not for commercial purposes because YOU are initiating it, not serving it.
For instance banking online or buying any product on Amazon would be considered a commercial transaction under your assertion, except YOU are initiating said transaction.
Even in copyright the fact of downloading copyrighted materials in fact is not illegal, actually acting in a commercial setting and uploading it is the actual infringement.
In any case, the point of the YT video was to show how reprehensible these companies can be and you need to protect yourself. If I get to my limit, I simply call AMEX (for which I put all such stuff on) and explain I tried to resolve and cannot come to a conclusion. They chargeback and take care of it. Then lickity split it gets resolved.
I would say that my operator (Verizon) has messed up my billing a number of times, but in every single instance they made it right and did so w/ professionalism. I can say when I had Time Warner, it was always a battle and I was happy to get rid of them. I voted w/ my wallet, however this merger will make it more difficult.