They also use the HTML injection (which I assume is why this was posted to HN) for the "five strikes" "Copyright Alerts" bullshit too; if you have an allegation flung against you, all of your HTML will have a Comcast popup injected into it until the account owner logs in and acknowledges that they were bad.

As an aside, check out the "Flexible Data Option" linked from that page for some other laughs - a $5 discount to drop your quota from 300 GB to 5, and also your overages suddenly become five times more expensive ($1/GB vs. $.20/GB). That's some nice math.