I'm just guessing but there is a legal concept call "duty of loyalty". https://www.google.com/search?q=employee+duty+of+loyalty https://www.google.com/search?q

I'm just guessing but there is a legal concept call "duty of loyalty". https://www.google.com/search?q=employee+duty+of+loyalty https://www.google.com/search?q=employee+duty+of+loyalty The short version of which is the duty of loyalty requires that an employee refrain from behaving in a manner that would be contrary to his employer’s interests. That probably means what he's doing isn't okay but of course laws are different in every area and IANAL. It's would be arguably different if he was a contractor I'm guessing.