Top is just marketing. In Big Tech it's market cap or something, but it's not proof of anything and may be just marketing. Google is a search advertising monopoly pretending to be a "tech" company (per Thiel), but is a "top" company to work for. Ok.

And intelligence agencies are government mandated, not marketing made. Or at least I haven't heard any marketing from the NSA saying how selective they are in admissions (as if that means anything).