Why do all cruise companies have to recruit China crew members through agents? Why not just recruit them?

Direct recruitment means directly signing contracts with workers and paying wages, so the premise is to set up branches in China and carry out actual operations. In this case, fixed expenses such as personnel and venues are involved, and they are not small. It's too much trouble to be audited by industry and commerce every year. Therefore, cruise companies only recruit through agents to avoid a lot of operating costs.