This depends on the solution to the Fermi paradox. An advanced civilization might have decided to not build defenses against a paperclip maximizer because it figured no other civilization would be stupid/evil enough to attempt AI without a mathematical proof that its AI would be friendly. A civilization near our level of development might use the information to accelerate its AI program. If a paperclip maximizer beats everything else an advanced civilization might respond to the warning by moving away from us as fast as possible taking advantage of the expansion of the universe to hopefully get in a different Hubble volume from us.