No it doesn’t? they can act like GK but betray bd later it’s commonly used.
Makes people trust you while I don’t use it that often it does work easily and can favour you
You can superficially act somewhat BD.
But you wouldn’t genuinely try to help BD.
Neutral King can do it because in the event that the help he provides makes scum lose he can just… not do the betrayal.
Neutral King doesn’t want to generally always help BD it might hurt them in some cases GK would care about princes safety while Neutral king wouldn’t theirs a lot of differences a smart bd can notice