[watwut]

> What? Why the hell would they need to steal or beat up people? They can buy existing mines, or establish new, robotic mines.

There are no money in your world, they cant buy them. Why would the owners sell anyway? Selling the land would mean they have absolutely nothing except money they can not start new business with.

>The water is getting too expensive now. [...] Because human-level robots do not exist yet

We are not carrying water in buckets. It is all done with technology now.

> Monetary economics only exists because human work is needed to obtain resources and produce stuff, and human work

No. It exists because people who have thing too much of a thing A and a little of the a thing B. Before money, people would barter - I will give you 5 eggs and you will give me 10 apples. Money were invented to facilitate the barter.