My aim isn't to guard against the answers being guessed, it is to deny the operator of the service asking those questions from gathering accurate data about me

My aim isn't to guard against the answers being guessed, it is to deny the operator of the service asking those questions from gathering accurate data about me that may later be exposed. Someone then trying to fraudulently use my identity info, or for any kind of socially engineered attack, would lose out. E.g. calling some financial service provider and trying to get a password reset based on D.O.B, mother's maiden name, or whatever.