Free Speech is a principle. Suppressing free expression is just as despicable when it is done by corporations and individuals. The principle is a social idea, not merely a limited guideline for governments.
Things like the Bill of Rights are just a manifestion of the idea that the principle is important, important enough to codify. That doesn't mean that the principle should be limited only to government.
That's far too much like the idea that rights of individuals are limited and are to be rationed out bit by bit when the document in question is based on the idea that governments are the entities who's power should be rationed out bit by bit.
You are taking the ideas that are embodied by the Constitution and Bill of Rights and turning them on their head.
Being a "tin plated overbearing dictator with delusions of godhood" is not cool and shouldn't be tolerated generally. Doesn't just have to be government.