If I was a lawyer with infinite time and resources, I might argue that:
a) there was a contract between them and me explicitly to allow me to watch the game (unlike, for example, a contract between me and my ISP to allow general access to the internet, or the licence fee allowing me to generally watch broadcast TV)
b) it was reasonable to expect to be able to watch the entire game - no one would buy a ticket to watch only part of the game
c) in the event of failure to supply the service, they are responsible to me, in a manner similar to a retailer (not manufacturer) being responsible for remedying problems with faulty goods
d) the get-out clause about not guaranteeing the stream is therefore not valid
e) they should thus compensate their customers, and then seek redress from their service supplier (as a retailer of goods would seek redress from a manufacturer) if they can establish where the fault was - their contracts with their suppliers should include service level requirements and provisions covering service failure.
Now you can probably see why I'm not a lawyer