At least one cryptography/security company is probably a front for a three letter agency. It used to be Crypto AG, but their cover was blown by Snowden.
SpaceX's "going to Mars" plans are just a cover for a vehicle that can allow the USA to utterly dominate Low Earth Orbit. Best part is that Elon thinks it's real.
I still think the "Going to Mars" plans are a stepping stone to mining the asteroids. The old book "Future Cities" from 1979 that I read as a kid (I'm 49 and I assume Musk and the other current billionaires did too) seems to be fuelling quite a few projects these days :) https://vdocument.in/the-usborne-book-of-the-future-558468df...