This is a big part of the metaplot of Ecplise Phase. No one is entirely sure what happened that caused the TITAN AIs to go rogue and bring about The Fall and the destruction of 90% of transhumanity, but one of the theories is that the USA's AIs were given free-reign to self-improve in order to counter China's super-AI project and things went very, very badly.
This is a big part of the metaplot of Ecplise Phase. No one is entirely sure what happened that caused the TITAN AIs to go rogue and bring about The Fall and the destruction of 90% of transhumanity, but one of the theories is that the USA's AIs were given free-reign to self-improve in order to counter China's super-AI project and things went very, very badly.