I believe the issue is that Oscars is perceived in a way by the public that could make it anti competitive to exclude certain film makers, especially if rules change so they just happen to match exactly one company, one which is seen as a threat to the status quo by at least some of the incumbents.
Essentially, if you claim to hold a competition open to everyone fulfilling certain criteria, and it becomes valuable due to marketing ( competition ) to participate, then you will have to accept some government scrutiny of rule changes to ensure they are not anti competitive.
Essentially, if you claim to hold a competition open to everyone fulfilling certain criteria, and it becomes valuable due to marketing ( competition ) to participate, then you will have to accept some government scrutiny of rule changes to ensure they are not anti competitive.