I play all my Steam games offline.
My problem is I only get 20 GB of data a month when that is gone it throttles back to the old dial-up speeds of the 90s.
So if I can play off line then every thing is Golden.
Your answer seems to confirm that I can do this so off to Epic I will go.
However it will be at 0200 hrs my time tomorrow when I am in my 6 hour window of 50GBs per month.