I don't have a definition of OP. Other than asking what someone is trying to say.
So has there been an abuse of "OP" to the point that Hitech became involved and we are on the cusp of a rule#? Or coincidentally Hitech prefers references to the OP of a post be kept to the personal reference of their signed in ID? Coincidentally speaking.....
As for Svengali and Trilby, George du Maurier was making money off the fad of Gothic horror at the time. That was the real Svengaliish taking advantage of people paying money for a mind reading show. Give people what they want to believe, and they will give you money even if it's a lie because they have already slipped their own critical factor for the magician on the stage to lead astray.
Do you want a red ball or a blue ball, oops, I only have that green ball bouncing away over there.....you will now cluck like a chicken until I snap my fingers and you will awaken refreshed and remember nothing. At least in the shrinks office he gets your permission which is just as good as a bait and switch to slip your critical factor. The more mundane the better.