The TM-Admin can set your chat history to auto-delete from the admin-dashboard controls.
Your chat history from 1:1 and group chat gets auto-deleted based on the time, duration, and time zone they set. They can control the auto-deletion to only messages, only files, or both on messages and files. The TM-Admin can randomly choose the users or groups on whom they want to implement the auto-delete. The deleted chat history can be permanently deleted or archived to the server based on their selection.