Because if you operate your own booking app you can set your own prices and you don't have to pay Uber a cut.
You'd also be able to use it to operate a private network of drivers. For example, large corporations can roll out a private web/mobile booking app for the private network of drivers they have for their employees. Not many companies still have drivers on payroll in the US, but in other countries like the UAE or South Korea this is still more common.
Why do some businesses use Google Apps in the cloud and others maintain their own CMS systems on their own equipment? Some businesses prefer in-house solutions.
You'd also be able to use it to operate a private network of drivers. For example, large corporations can roll out a private web/mobile booking app for the private network of drivers they have for their employees. Not many companies still have drivers on payroll in the US, but in other countries like the UAE or South Korea this is still more common.
Why do some businesses use Google Apps in the cloud and others maintain their own CMS systems on their own equipment? Some businesses prefer in-house solutions.