alt Hacker NewsCitymapper tried something similar in London a few years ago: https://www.theguardian.com/technology/2018/feb/21/citymappe...
I'm not sure what came of it; but I guess it didn't get adopted by the TfL so it never really became part of the transport system of the city.
I tried it out at the time. It was a minibus driving only me around for the price of a bit more than a bus fare.