This just shows that there is no such thing as a rational maximizer. Tech companies spend massive amounts of money on extremely high priced office space to be in SV and then have to pay a huge premium for employee compensation because the local housing market is ridiculously overpriced.
Suddenly, employees start leaving the Bay Area for cheaper real estate after figuring out that they can do their job just as well at home as they can in the office thanks to the very same technology that they work on for a living.
A company that had officers and directors who were really concerned about managing expenses and shareholder value would see this as a big opportunity to slash costs by ditching SV for a combination of remote work and dispersing offices to other parts of the country where office space is a fraction of the cost in SV.
But no. This will never happen because all the C suite people at the tech powerhouses have multimillion dollar homes in the Bay Area with stunning views of the ocean and ski in ski out chalets in Mammoth Lakes. They would rather blow millions every year on expensive SV real estate and excessive employee compensation than have to go live around the commoners in Columbus, OH or some other place where they could save millions in fixed op costs.