Yea so the problem is you can't think of tech as one industry. Every company that's being created right now has to involve software one way or the other. That's why companies like Tesla (auto), Netlfix (entertainment), Solarcity (energy), Sofi (finance), airbnb (tourism), uber (logistics), tons of biomedical companies that I don't know the names of (medicine) all headquartered in the bay area.