Also, to be blunt: freedom of speech is freedom from government censorship. A private business is not, by the very definition of the term, capable of infringing freedom of speech. Public institutions? Sure, though it can get complicated. Private business? Nope. Even then, freedom of speech doesn't override other peoples freedoms. So you can be fired from a public institution or arrested for inciting others to violence (for example), and that still isn't a freedom of speech violation.
And that's a sad thing - freedom of speech should go beyond government censorship. Also turn it on its head - even if the government doesn't censor you, but every corporation does, including every employer, so for instance you become "unemployable" because of something you might have said a decade ago, do you have rights at that point?
I mean, for an extreme argument, look at slavery: the government didn't employ slaves, private organizations and individuals did. I'd love to see for some targeted Supreme Court cases that work to strengthen freedom of speech rights, say, in the workplace.
Take the stuff about something as mundane as the nonsense surrounding Kevin Hart (I'm too lazy to even look up spelling) and the Oscars or whatever because of some jokes he made. Look at all the other media figures who have had their livelihoods destroyed because of something they said. Look at all the nonsense about codes of conduct for computer source code, because heaven forbid it might have swear words or derogatory comments in it.
Now, I'm not condoning any of the things that might have been said, but it's the complete erosion of due process or even reasonable consideration. Yeah it was all done by "private industry", but it's becoming just as bad as if it was the government: people are getting more and more restricted in their behavior - and even so fearful and over-stressed because of it that it's starting to manifest in public health issues (extreme increases in social anxiety disorders, especially in teens).
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Regarding platforms: I think the issue is that most "platforms" like Youtube or whatever hosting site, are there for people to express themselves. You aren't forcing YouTube to "distribute your message" by posting there - YouTube is already distributing messages. I agree that YouTube doesn't have to
monetize every video though - they should only monetize the ones that make them money with enough views.
"Not having access to the most convenient means" is an interesting phrase too - consider if instead we said "not having access to the most convenient voting booths" or "not having access to the most convenient schools."