Are you an overly generous Netflix subscriber who has a habit of sharing your password to people outside of your household, such as a favorite uncle or long-distance girlfriend?
Maybe I'm out of town and watching a movie from a Hotel while my family is watching from home - that's legit. And according to the plan I'm on now, I can watch on 4 separate screens at once, with nothing saying that they have to be in a close physical location - just "same household"