Well, I for one simply assume that ALL MY OPPONENTS ARE NICE PEOPLE 
I use the M log quite much in my correspondence games, not only for entertaining kibitzers and giving my opponent a good laugh after the game, but also for reminding myself of dangers I’ve noticed and for jotting down my world board domination plans.
And as it happens, I have often accidentally posted such variations in the game chat instead of the M log … so … I guess I don’t really care if somebody would try to cheat by reading my M log 