You should read Graeber’s book sometime.
There are jobs that are useless but still benefit business owners financially. Graeber gives the example of a receptionist at a small firm. The firm had so few callers and visitors that the receptionist was totally unnecessary and sat idle most of the time.
Why did they hire her? If the members of the firm answered the phone themselves, they would not be taken seriously. Every serious firm has a receptionist to answer the phone, so they felt they had to hire one. She was essentially there as decoration.