Rooms will exist indefinitely, so long as there is at least one person
actively talking in the room. A room is considered worth retaining if
it has more than 15 messages by at least 2 users.
Rooms not worth retaining which are inactive for 7 days will be
deleted. Rooms worth retaining which are inactive for 14 days will be
frozen. Frozen rooms do not allow any new messages to be sent, and are
not shown in the default room list to prevent cluttering the rooms
Only moderators can take action to remove/freeze rooms; normal users cannot and must wait for an automatic action by the system as described above.