I don't see why tools which monitor application/hardware usage is good enough? Besides if they can developer AI which can detect malicious codes to hijack supercomputer, why limit it to cryptocurrency mining when there are other malicious things (such as stealing information or make server down).
Maybe this is just the first step to it? Maybe they are trying to teach their AIs to detect unusual behaviors that might help them develop an AI to prevent malicious things like you mentioned.
That might be true since detecting hardware usage sounds easier than other tasks, still the usage is too nice IMO.