Call it something like greentext or confessions or something. Anyone posting is automatically set to Anonymous with no link whatsoever to the original account for admin or users to track or in the logs/activity pub etc. Like the person will not get replies, notifications on their account for the post, or the ability to reply as Anon. Simply streamline creation of a throw away account using the existing credentials of an existing account for post access and to give automod a chance to act. Maybe bar new accounts or below a certain threshold of engagement.