San Francisco is a place. Engineering talent is available everywhere, though perhaps most places it isn't so much fish jumping onto the line as in the Bay Area.
What about all the nerds who are Polish, Portuguese, and Peruvian and choose to remain local because their spouses, children, and other interests are? They can still code, some of them are definitely brilliant, and they can either work locally or (more likely) remotely.
Starting a "startup" with venture capital might be next to impossible in Peru, for all I know, but a hell of a lot of folks don't want to exit, don't want to dilute their ownership of their product, and frankly like the environs elsewhere.