I tended to agree with your sentiment. But the reality is that for some unknown reason to me, it's companies from SV the ones that get famous and used globally.

Why didn't this start from say Mexico? Or Singapore or Vietnam? Or at least Germany which has a good record of freedom conscious tech scene .

My bet is in something related to the "maslow pyramid": people in SV have so much money that have everything solved in their lives, so they have the luxury of spending their time in this sort of problems.