> How do people still not get this? The First Amendment is a limitation on the government of the United States. Period. It does not apply to other countries. It does not apply to private entities within the United States. It does not apply to Facebook, Twitter, Reddit or any other social media.

To be fair, most of the time I hear your complaint, the people complaining about the loss of free speech has nothing to do with the Constitution (though that isn't the case in this instance, of course). It's possible to oppose certain speech restrictions as damaging to a community you care about and to be upset when those restrictions arise. Not for constitutional reasons, but for reasons having to do with the health and ethical grounding of a community.

Though this is just my sample: It's of course possible that we are exposed to very different circles and that you're more often exposed to "Reddit can't ban this subreddit! It's unconstitutional!". If so, I'm sorry, that must blow

Maybe it shouldn't be:

"... a social tyranny more formidable than many kinds of political oppression, since, though not usually upheld by such extreme penalties, it leaves fewer means of escape, penetrating much more deeply into the details of life, and enslaving the soul itself."

--John Stuart Mill

Pretty much exactly this. If you don't have a practical right to exercise free speech, you effectively have lost the right in it's entirety.