All throughout history, it is usually another society who comes in and takes an already occupied land by force and then charges a fee for the previous people to continue using it. Then there are complex laws set up to make it impossible for these previous people's to own their land again, becoming indebted in one way or another. After a while, after this land has been transferred, typically amongst the families of those who first took the land (or their friends), some people forget this history or are ignorant of it, and just go along with what has been done for years. Inevitably, those with the excess monetary value gained from rent is used to expand and establish these kinds of societal institutions so that it is part of the zeitgeist and thus a controversial take to think this kind of institution is an immoral, or bad, or exploitative one.