As an employee of a corporation, I often speak my mind. The most I risk is being fired, and I believe I can find another job relatively easy. I sometimes do keep my mouth shut, because saying the truth would get me some sour looks, and I don't feel like dealing with that right now.

I lived for a few years behind the iron curtain, in an actual honest to god dictatorship. The fear pervading and perverting society was palpable. Say the wrong thing at the wrong time and you might die, and your family will suffer too. Not to mention destroying your career and social status. Best to lie most of the time, even to realtives. You never know who to trust, and the price of a mistake is enormous.

From the way you phrased your question, I get the feeling you have no idea what a dictatorship is like. The two are only very superficially similar. Look at how Navalny ended up vs Ilya Sutskever.