A sort of work around this is if you have a laptop and can find the mac address of the chromecast you can set the mac of most wireless cards in most laptops today, gain the authority needed and then remove the MAC address from the laptop and chromecast should work. I travel heavy bringing a small wireless router everywhere I go. Some nicer hotels, your Hiltons and Marriotts, still provide a wired ethernet jack which I use to just plug in your router there and agree to the internet terms through your laptop or phone connected through the router and then it allows all devices access because the hotel only sees the 1 MAC address of the router itself.