Here is an interesting look at how these tech billionaires are building their own versions of Utopia. Of course, this notion is nothing new. Throughout history, people with money and power have made infrastructure decisions for others. Sometimes things go right and sometimes they go disastrously wrong. But the equation will probably always remain the same.
An example from the article:
Elon Musk has started to build a tunnel prototype in Los Angeles. With the Boring Company, he wants to build a 17 mile tunnel from the Los Angeles San Fernando Valley to the Los Angeles International airport. There are many reasons why this isn’t a good idea, spanning from environmental hazards and risks to private land concerns. Others have argued it isn’t a practical solution for the area and that it would make much more sense to build a “light rail” to the airport, where more people can benefit. Musk has dismissed this, not wanting anything “public,” as he prefers to avoid other people in his commuting space and expects others to feel the same.
Having lived and worked in Southern California since 1985, I can tell you that the idea of a tunnel network comes up all the time. He is already taking steps to build this with the seeming buy-in of politicians and the local government for a pilot test.