With sport at the heart of the pay-TV ecosystem, dedicated online-only streaming services could emerge as a threat to leading players like Sky 

The liveliest newcomer, DAZN, launched in 2016 with mostly second-tier sports. Now in seven markets and counting, it has recently made bold moves into top-flight competitions, notably in Italy, albeit as a secondary player 

History has not been kind to those challenging pay-TV incumbents by selling sports unbundled—particularly in Europe, as Setanta, ESPN, beIN SPORTS and Mediaset can testify. If DAZN can stick to secondary positions in premium rights, or simply less-expensive sports, perhaps it will fare better