There's no "right to free speech" on this forum, whatsoever. We post here under the good grace of theymos, operating under the belief that any of this will continue to exist under his rulership.
Do you have any proof of what you say? I have the opposite impression, that here there is much more freedom of speech than in most internet sites, and I don't remember anyone being deleted comments or banned for expressing their ideas.
In fact, if there wasn't this so-called "freedom of expression", people wouldn't create these alt accounts, often to make meaningless observations.
Now, having freedom of expression doesn't mean that people have to offend each other - although that sometimes happens here, and even then they aren't banned.
Therefore, I think there is good freedom of expression, as long as what is said or done does not cause direct harm (such as suffering from some scheme).
I have no problem as I said having an alt account but when joining contests, spreading manipulated lies just because you do not like someone with an alt account is abusing the opportunity of the freedom of speech. It's personal hate and cheating.