They take a profile of every member of your house. They connect monitoring devices to all of your televisions. Whenever someone watches a show, they put their ID into the device so it registers them as watching the channel the TV is turned to.
For computers, they now have apps that can monitor whether you’re going to a streaming site or not.
But you’re right that they can’t catch everything. But it is still works well for live watching cable/satellite programming.
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