It's obvious that private companies should draw their own lines. That's the entire point of private property, as long as it's not unconstitutional, they can do

It's obvious that private companies should draw their own lines. That's the entire point of private property, as long as it's not unconstitutional, they can do what they like. It's their property. And of course they do it in their own interests, that's the duty of a fiduciary.