Sam Spade writes:

Most Americans do not understand that Freedom of Speech (1st Amendment)
provides protected speech only from the government. It does not apply
between citizens, corporations (or similar entities), or between
citizens and corporations (or similar entities.

That's because only the government has enforcement power. Corporations and
individuals cannot enforce prior restraint; the government can. Therefore
freedom of speech restricts the ability of the government to do these things.
Other entities have only tort to resort to, or sometimes they can file
criminal complaints, but the government remains the agent of enforcement in
both cases.

It doesn't matter whether or not a corporation approves of what you say,
because the corporation does not control the whole of society. You can still
say what you want independently of the corporation. But government censorship
is different, because there are no alternative venues. Therefore freedom of
speech acts mainly to restrain governments.

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