Netflix could probably get enough goodwill by just automatically not charging people who didn't use their service at all as to be worth it. No hassle, we just keep rolling your subscription over until you watch something again (of course they make interest in the month you paid but didn't use services - that $0.05 should pay for the email and other infrastructure costs needed for a customer that doesn't even use the service). The real benefit of this is when someone does watch something there is no hassle - they are already subscribed and so they don't even think about should the re subscribe.

Of course with their ad supported tier they probably don't agree.