Why did SF sign a contract with Ruibo Manpower?

This situation shows that it is a labor dispatch model.

After successful recruitment, SF signed a contract with Ruibo Manpower, which means that the employees of the labor service company are not employees of SF, but are sent to work in SF by the labor service company. This position belongs to the recruitment on behalf of Guangdong Ruibo Human Resources Service Co., Ltd., and signed a labor contract with Guangdong Ruibo Human Resources Service Co., Ltd. to serve SF Express.