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

Direct recruitment refers to directly signing contracts with workers and paying wages, so the premise is to set up a branch in China and carry out actual operations. In this case, it involves fixed costs such as personnel and venues, and it is not a small amount. It's too much trouble to accept the industrial and commercial audit every year. Therefore, cruise companies only recruit through agents to avoid a lot of operating costs.