The fact is that most people want their internet experience to be a hugbox from which they can remove dissenting opinions at will, and the only way to defy this majority and have truly free discourse is to not give anyone the tools to curate what they see and who they interact with (whether purposefully, or just through incompetence.)

This means no decentralized platform can ever guarantee free speech, because someone will come along and add censorship features to it even if the original developers didn't.