This seems to be a great way to tell your relatives and loved ones what a bitter, revengeful person you had been all along, who couldn't even find forgiveness in death. There is also a massive potential for abusing such a service to destroy the lives of people you hated, disliked or were jealous of during your lifetime. Just let the coffin confessor tell some made-up story during your funeral. Who would question the last confession of a dying person?