It's in Satya's interest for employees not to demand raises. Goes for men too. I bet he tells employees not to share salaries either. All it does is breed discontent when you find out how much more your peers make. Instead, you should work super hard and hope the salary fairy will recognize your contributions!
Everyone in a company should go interview every year or two and figure out how much $ you're worth. If you're underpaid, you'll be in a great position to either get a raise or hop jobs.
Of course assholes like Mark Suster will tell you not to hop jobs -- you might get paid what you're worth! Instead, you should stay at startups, be underpaid, and bust your ass. Especially if Mark invested. Don't listen.