I am absolutely furious right now. All I want to do is watch Black Sails on Starz on the treadmill by using the app on my phone and casting it to the TV. The Stream app blocks this. I can't use the Starz app because Xfinity is no longer supported, even though every other provider is. I'm paying over $200 a month to have access to this programming, this is not OK. When will Xfinity put its customers first. I'm very tempted to ditch Xfinity altogether.
This really isn't Comcast's fault. The networks want tight control of what devices are used. It's up to the deals made between Comcast and the networks and media companies. It would probably cost Comcast more $$$ in rights if they allowed casting since the networks would want more money for viewing on a 'real' TV instead of a mobile device.
This is NOT a Comcast issue, all the networks are determined by the network. If another company offers it it's because they were able to work out an agreement. Comcast has ZERO benefit in limiting their customers access through other means. It's all going to be app based anyways so give us some time and I promise you'll be happy! Hope it works out for you