Check out WireMin; there’s literally no censorship or moderation. Sometimes I feel like it’s too easy for people to join and say things without any concerns 😅 because it doesn’t require linking to your personal information such as email or phone number. However, it still meets your expectations. http://wiremin.org/

If you don’t want any spam or inappropriate content to appear, you can create your own Feed space and post stuff. It can automatically vanish after a time period that you set.

How did you make that Title?!