"To be clear, this unwritten agreement was that Google would not go after Apple employees, and vice versa. However, employees of both companies were free to apply to the other company on their own, we’re told."
While this doesn't affect employees' ability to find jobs as much, it would affect their pay (as there would be no bidding wars over employees wanted by both companies).
Edit: Sorry, this was supposed to be sarcastic, but came off as just plain stupid.