Now people pay more and more attention to the labor law, and it is really good to monopolize the welfare of state-owned enterprises. In order to safeguard the interests of employees in the so-called system, the real work is basically outsourced to labor dispatch companies. They pay the labor dispatch company and then hire people to work for them through the labor dispatch company.
On the one hand, it saves personnel costs, on the other hand, it avoids employment risks.