> Who decided that Freedom of Speech _only_ applies to government suppression

Which freedom of speech are you referring to? Because if you're thinking of the first amendment, then the people who decided that are the ones who wrote it, and it's pretty clear in the text.

I feel like you're being obtuse. The concept of free speech was not invented by the US Constitution and has existed long before it was written. Free Speech as a societal principle and ideal has been around for hundreds of years.

"Free speech" might be a societal deal, but it's never meant what you are claiming it means. You are free to redefine it as you like, but it's never meant people are forced to publish your book or an employer can't fire you for being rude.