T-Mobile customers who want to watch the hot new Netflix show “Master of None” or the old HBO favorite “Game of Thrones” can do so without counting it against their data caps, if they use the wireless carrier’s popular new Binge On service.Good news for consumers, maybe, but it is worrying some consumer advocates, who say the service could be the beginning of attempts to circumvent the government’s net-neutrality rules before they have even taken root.