The point is that the family might actually want to upload their stuff to the social network, while using an OS and associated software doesn't and should never

The point is that the family might actually want to upload their stuff to the social network, while using an OS and associated software doesn't and should never translate into surrendering all use and other personal data. Would you find comfortable if while eating at the restaurant with your SO, a waiter sat at next table constantly staring at you two, and taking notes on what you eat, how you do it, in how much time and how much you appear to have enjoyed it, possibly also by analyzing your words? Stupid example maybe, but that would be just one of the many exact equivalents in real life. Don't tell that to toilet manufacturers:)