You walk in to a home expecting to meet your friend, when you enter there is a man from the TV network there. You didn't expect him, his intention is just to watch you and your friend talk about television shows.
Maybe the analogy should be: you go to meet a local contractor, and a representative from the cable company is there to help advise on the work. Neither of you are aware that he is recording the whole conversation, and that will use that information to send you targeted junk mail.
Maybe the analogy should be: you go to meet a local contractor, and a representative from the cable company is there to help advise on the work. Neither of you are aware that he is recording the whole conversation, and that will use that information to send you targeted junk mail.