“It usually takes a few hours to complete a task, which earns them 100 to 500 yuan ($15 to $74), they say.”
Architects and engineers with twenty years of experience are selling their actual working knowledge by the task, at rates that top out around $74. One of them describes it as teaching a child, using problems from her own job. The labs get a domain expert’s judgment for the price of an afternoon, permanently. The gig ends when the model no longer needs the teacher.