It is designed for mobile devices a console is a mobile device as you can move it from room to room or from one location to another,its also a paid for service on console.
Being available as an app on another TV service would not be of any benefit to Sky,it would potentially cause a loss in revenue by people using it in place of multiscreen.
Being available as an app on another TV service would not be of any benefit to Sky,it would potentially cause a loss in revenue by people using it in place of multiscreen.