...The difference is an Uber involves an extra middleman. This middleman does none of the actual work but expects to be paid. An added cost. Good for the middleman, minimal work (an app?) but bad for the customer and society (an inflationary pressure)...
With respect, I don't think you fully understand how Uber operate.
They are certainly not a "middleman" who "does none of the actual work but expects to be paid". In fact, they do
all the work, apart from driving the car.
They built the company, created the brand, they do the marketing and the advertising (without which, you wouldn't even know they exist), they are developing and supporting the app, they are vetting the drivers, they are managing the payments (and refunds, where due), and they employ the people who do all that, etc.
Before Uber, we had minicabs, with the minicab company managing the office, receiving the calls, and dispatching the drivers. This wasn't done by volunteers, either.
What you see as the customer at the point of receiving a service, is a person who stands at the top of a pyramid made up of others who work hard to provide the support required to ensure that you and that other person actually meet and that you receive the service that you are paying for.