It's set up a bunch of middle men, but undercuts local businesses and leads to a lot of desperate and impoverished workers. When you create a just-in-time labor system, this creates a huge amount of stress for workers, as their hours and wages are unpredictable. This is fine if you don't need the money or are just supplementing a full-time income. But you can't live that existence if you have fixed bills and want to have a stable middle-class existence