Anyone at the studio who is shocked by this movie flopping needs to be fired right after they fire whatever weirdo gave it the greenlight.
This is some shyt that you half the budget, hire B-list more affordable actors and make for HBO.
I came in to say the EXACT same thing.
I understand why they made the movie cause it's a fascinating historical story that no one knew about, but there is no mass audience for this shyt. If they hadn't spent so much money on the cast, been a little more conservative in picking scenery, they could have made a more affordable movie and gotten out fine.