You can’t poach talent, because companies don’t own their employees.
You can steal trade secrets, which is what this case is about.
(If you’re going to suggest a full rewrite of IP and anti-trust law, you should at least have an understanding of the current situation.)
> You can steal trade secrets
Which goes beyond a civil lawsuit as well, if true, these employees are going to face real, serious criminal charges and possibly jail time. Up to 10 years in federal prison, and Apple has a history of pressing criminal charges.
If Liu actually did exploit a vulnerability to bypass Apple's network security, they may also see federal charges for CFAA as well.