There are two possibilities for employees to leave their jobs. One is that the salary is low and employees leave voluntarily. The other is that the employee made a mistake and the boss asked him to resign voluntarily.
In the second case, there is no cost for employees to leave, and employees who do not leave will cause harm to the company.
In the first case, the boss will weigh the pros and cons. For the boss, the working thinking mode of the old employees is clear to the boss. When the boss knows an employee like the back of his hand, he won't take the initiative to keep him. Keeping him is of no value to the boss.