The big companies didn’t control publishing on the song. Follow the money. They aren’t going to negotiate for distribution rights for an “Oscar winning” song and they have no interest in the publishing until it wins.
There are always “Oscar winner” song albums.
I think it was anti-christian bias and because historically accurate portrayal of the conflicts with indigenous peoples is now considered racist.
Everybody knows that the natives lived in total ecological harmony with the earth mother and it was all peace and light until Europeans showed up with their evil guns and religion. /s