Earlier quoted context omitted.
This feels to me like hubris, a kind of 'end of history' prediction that we have finally progressed to at least the beginnings of a final moral order. Personally I don't believe this to be the case, and the ways it can go wrong will leave us wishing that freedom of speech protection had not been eroded.
No one is eroding anything, please don't be melodramatic. Free speech is a protection from the government , not products offered by corporations; end of story. You are free to not use reddit, or create your own reddit.
There's plenty of material in the philosophical world about freedom of speech in regards to censorship by private parties and other people.