Steve Jobs was the central figure in influencing the anti-poaching policies from what I've come across.

https://money.cnn.com/2014/08/11/technology/silicon-valley-p...

This is why market demand works for the benefit of the employee.

> "Only when Facebook declined did Google consider how to retain its employees, the judge said. It boosted "the base salary of all of its salaried employees by 10% and provided an immediate cash bonus of $1,000 to all employees,""