Em inglês tem a expressão "confidence game" ("Are you playing a confidence game?") que expressa mais ou menos isso. Uma expressão popular é "the con game."
"A confidence trick or confidence game (also known as a bunko, con, flim flam, gaffle, grift, hustle, scam, scheme, or swindle) is an attempt to defraud a person or group by gaining their confidence. The victim is known as the mark, and any accomplices are known as shills."