Indeed. When we turned off cable in the nineties, an eager young fellow came to the door with a proposition. He was from Nielsen, and was delighted to find a family with a TV and no cable! We signed up for a year or so, and they came in with some incredibly frowzy phone lines and dongles to automate sending data summaries at 3AM.
We drove them bonkers with long periods of watching Channel 68, which was static/snow in our area without a registered channel. They kept calling to ask to check on the health of the system, and we had to keep telling them the data was accurate - we had it on for white noise so the baby could sleep while we did housework.
Finally we bailed just to get them to shut up, since dealing with this special case seemed to be beyond their comprehension, let alone their data gathering protocol.
"Try and understand the words, they will be English: 'We don't watch TV.' "
Told them that up front, yet they still wanted our info. Except not really. Sayonara, suckers.