The systems they manipulated were systems that were likewise designed to outwit dumb human and computer traders. I can see there is some distinction if you mak

The systems they manipulated were systems that were likewise designed to outwit dumb human and computer traders. I can see there is some distinction if you make trades purely for the purpose of invoking a reaction from other traders, but an intelligent AI system will discover this effect and do the same thing, albeit without any explicit human intention behind.