Good point! ..Tricky though perhaps, because often there are two human players present versus the AI (in realms etc), but for human versus AI duels maybe the chat box functionality could be greyed out or something.
...I think it's just preparation for when the day comes when the AI will eventually be able to talk and have thoughts and dreams and feelings.. and take part in banter, tell non PC jokes, troll opponents etc... I heard that CGR is making great strides, the AI has already learnt to say 'Shall we play a game?' ..Whatever you do, don't suggest Global Thermonuclear War.