The chilling effect on speech on social media platforms is because they are ad funded, nothing more. Advertisers have no desire to be associated with controversy.
If someone wants unfettered speech, it has to be someplace for which they are willing to pay the hosting and moderation bills. "Private businesses don't owe you a platform for your speech" as the American left liked to say.
Meanwhile, the Swedes seems able to run a forum entirely supported by ads, yet still enable unfettered freedom of speech, together with really strong moderation, which results in a place where you can actually discuss pretty much anything. Online since 95 although taken offline in various points of it's life: https://en.wikipedia.org/wiki/Flashback_Media_Group
Maybe it's just the American way of doing ad-funded social media that is the problem?