so if someone leaves and starts their own company you can prevent them from actively recruiting former coworkers but you cant prevent them from hiring former coworkers who went to join them on their own without any active solicitation from the former employee, basically if the current employee contacts the former employee first then it is ok but contract forbidding the former employee from contacting current employees to recruit them is allowed. Also contract forbidding the active recruitment of current employees that the former employee never met are not enforceable so you cant forbid recruiting employees who joined after you left the company