You have a phone and a TV too, how about if they require you to maintain a phone/tv connection to play the game, because, you know, you have them too so why not?
Having internet is part of the price for playing, it would seem, much like having a PC capable of running the game is. Life lesson learned: don't buy and play in-development software, and expect to get a refund just because a feature you wanted is not implemented.
People who are deserving of refunds will get them, those that do not will not. Frontier might change their policy in this instance, but until they do further discussion is pretty useless.