How could they ever prove the difference between a bug and malicious intent? If they want control over the process then don't ask Apple to do it for you. Also,

How could they ever prove the difference between a bug and malicious intent? If they want control over the process then don't ask Apple to do it for you. Also, Apple wouldn't be able to test it well because the custom OS was written to only work on that specific phone (not the model of phone, the defendant's phone).