An em might be fooled not only by deceptive inputs about its environment, but also by misleading information about its copy history. If many copies were made of an em and then only a few selected according to some criteria, then knowing about such selection criteria is valuable information to those selected ems. For example, imagine that someone created 10 000 copies of an em, exposed each copy to different arguments in favor of committing some act of sabotage, and then allowed only the most persuaded copy to continue. This strategy might in effect persuade this em to commit the sabotage. However, if the em knew this fact about its copy history, that could convince this remaining copy to greatly reduce its willingness to commit the sabotage.
Robin Hanson, The Age of Em: Work, Love, and Life when Robots Rule the Earth, Oxford, 2016, p. 112