I can only guess, but it looks like a circle-jerk in these ultrarich-by-creating-nothing-of-value "tech-bro" spheres. Even the articel suggests

Bunker life is a well-documented fixation among tech billionaires, particularly those who identify as doomsday preppers. There's also a fascination with buying large estates in the Pacific and even owning small islands there.

Once you reach a certain level there is nobody who dares to question you or your believes. It's all yes-man trying to get a piece of your cake.