In a move similar to this, the administration at a MUD (Multi-User Dungeon; a sort of text-based MMO) I once moderated for had a signup and entry procedure that required the user to read and agree to an AUP (Acceptable Use Policy). At the very end of the AUP was a specific command phrase that the user had to type in to join the game proper. Sadly It was fairly common to see a prospective new player complaining they couldn’t figure out how to complete the registration process.
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