This is oversimplifying too much IMO. Obviously the potential reward working at startups is much higher than megacorps, and you can very safely say that people

This is oversimplifying too much IMO. Obviously the potential reward working at startups is much higher than megacorps, and you can very safely say that people working at startups have a higher risk appetite. However, plenty of people work 9h-12h a day (say, at Meta) in wish to get promoted at rocket-speed and play to "win" the higher TC at megacorps, and it happens often enough that very-driven people do join megacorps.