They don’t. It’s an open area of law. Legal advice will follow the clients interests - better to put no poach clauses in. Just in case.
Shakespeare said something about how to handle the lawyers.

You can see them on display at Musee Ariana in Geneva.

These plates were made by Paul Scott in 2012 and illustrate the nuclear power stations still in operation in Switzerland.

But he wasn’t a genius at mega project delivery. We struggle to value this skill in the glare of the Sun reflecting off those tiles.

Thank goodness process safety has come a long way since the 1960s.