These are not stupid people, they must know basic stuff like money being worthless when society collapses. Before posting this article I read a whole bunch on the same topic, here is an interesting quote from another one [0]:

> "This single question occupied us for the rest of the hour. They knew armed guards would be required to protect their compounds from the angry mobs. But how would they pay the guards once money was worthless? What would stop the guards from choosing their own leader? The billionaires considered using special combination locks on the food supply that only they knew. Or making guards wear disciplinary collars of some kind in return for their survival. Or maybe building robots to serve as guards and workers — if that technology could be developed in time."

[0]: https://onezero.medium.com/survival-of-the-richest-9ef6cddd0...