> I always thought Zuck-level money gives you better options, such as building your own loyal community

Zuck-level money wouldn't matter in a situation where a bunker is needed though. In a post-money situation, Zuck doesn't have anything to offer compared to a random man, so nobody will have any reason to join and partake in his "village" plan.

A really serious (or at least as close to serious as we can get when imagining apocalyptic scenarios) plan would be to stockpile goods/food/a means of production - those things are what's going to be valuable once shit hits the fan and might actually convince more people to join him.