It would definitely solve a lot of issues, including controlled and balanced housing cost for the employees, group/public transport, and above all a vibrant community.
Is it a permit issue? Or something else?
https://www.mercurynews.com/2019/02/08/facebook-unveils-new-...
https://www.citylab.com/equity/2019/06/google-affordable-hou...
I get what you're saying, and I want to agree, but it smacks of the old Company Town that I grew up in, and the current FIFO/DIDO living conditions of remote Australian mining towns.
It is bad enough that so many FAANG employees are in trouble with immigration if they lose their jobs. The fear of losing one's home would be a pretty powerful force in labor relations.
Yes, it would be a good to build more housing, and it would be convenient to reserve some of that housing for your workers, and it would be a perk to subsidize that housing for your workers, but we'd have to wrap some serious regulations around them that would likely make Company Housing devolve pretty quickly.
Where you see a "vibrant community" I see an inexistent work-life balance and gaited communities. It would be a real life echo chamber, SV is already enough of a bubble as it is I doubt they'd need a FacebookVille or a GoogleVille.