Do you truly believe that? It's a privately owned place to post thoughts, you were not being restricted if no newspaper would print your letter to the editor.
People forget: none of these services are direct connections between one person and their audience like the telephone or public square. There are always three distinct steps: 1. You send content to them, 2. They analyze/curate, and 3. They publish it (or not) to the recipient(s). If you want a direct connection unencumbered by a company, choose a medium that works by establishing direct TCP connections between users.