A T-Mobile service called Binge On that allows subscribers to consume as much data as they want while streaming video from selected providers violates Net neutrality rules, according to a published analysis from Stanford University legal scholar Barbara van Schewick.\nNet neutrality\u2019s core tenet is that service providers shouldn\u2019t be allowed to discriminate between different types of traffic they\u2019re asked to carry. By offering some video services \u2013 including Netflix, Hulu and HBO \u2013 and not others as \u201cfree\u201d streaming options, and not counting mobile data consumed from those services toward a user\u2019s monthly cap, T-Mobile is essentially favoring some kinds of video content over others, van Schewick wrote.\n+ALSO ON NETWORK WORLD: What it means: The FCC's net neutrality vote + Open source optical network could create a new Internet\n\u201cBinge On allows some providers to join easily and creates lasting barriers for others, especially small players, non-commercial providers, and start-ups,\u201d according to van Schewick. \u201cAs such, the program harms competition, user choice, free expression, and innovation.\u201d\nStiff Net neutrality regulations on ISPs were upheld last year by the FCC, but carriers have vowed to challenge their validity in court.\nThe report from van Schewick, which can be read in full here, cites numerous problems with Binge On. The program excludes services that use the user datagram protocol (UDP), which includes YouTube. It also puts start-ups in the awkward position of having to choose between using UDP, which can have technological advantages, or being eligible for inclusion in Binge On.\nT-Mobile has yet to reply to a request for comment.\nBinge On is the latest instance of \u201czero-rating,\u201d the practice of offering unlimited access to provider-selected content, to come under fire from Net neutrality and open Internet proponents. Perhaps most controversial has been Facebook Zero, an attempt by the social network to offer subsidized Facebook access to subscribers in developing countries, where a large proportion of users are restricted to mobile ISPs. Critics charge that this is more of an attempt to make inroads into new online ad markets than it is a high-minded effort to offer broader Internet access to underserved areas.