I wonder if it would be possible for the whole world and all activities to end up being "owned" by one company?
That said, whether it's one company or a few that are well-aligned doesn't really matter for the purposes of that book.
but a corporation who only uses land without consideration for it or the local animals that depend upon it, and only cares for profit cannot "own" something that is essentially timeless and really belongs to noone but the universe. Its like ants squabbling over owning mount everest.
And here it is in action:
https://milo.yiannopoulos.net/2017/08/google-threatens-conse...