If you have satellite or cable they monitor everything you watch and that information is used in ratings calculations. You don’t need to be a Nielsen family. Satellite and cable data is also used to determine viewing numbers.
Source?
You are right. Comcast knows what house is watching what and when. They all monitor that.
That is why they have those awful packages that force you to pay for garbage that is watched by a very few, but is politically correct.
That is what I figured, too. Is Nielson even used anymore?