I'm pretty sure Comcast aren't the only ones doing this. I had mobipcs for a while (when I just got new house, had to wait for DLS to get installed) and they i

I'm pretty sure Comcast aren't the only ones doing this. I had mobipcs for a while (when I just got new house, had to wait for DLS to get installed) and they injected js that tracked your browsing and replaced certain ads it found (as well as caused various errors because it wasn't written properly). I wouldn't be surprised if other companies did the same.