In a large organization the "Town Square" channel can be full of annoying non-work-related junk (e.g., zealots arguing over the merits of Ayn Rand's collective works). I should be able to exit the "Town Square" like any other channel. Likewise, I should be able to re-add "Town Square" if I so choose. Alternatively, administrators should be able to restrict posting to "Town Square" to administrators.
You might find this proposal usfull as well: https://mattermost.uservoice.com/forums/306457-general/suggestions/33917131-warning-message-for-all-posts-in-town-square
[Deleted User] commented