Those type regulations don't exist everywhere and they still cry foul when they are asked to have insurance other than the personal minimum liability required by the state for a private noncommercial car. It appears to me that they simply want to first reduce their costs as much as possible by putting the burden of maintaining a fleet of vehicles on the drivers but when they have trouble finding drivers because they can't support the burden they try to claim they are exempt from insuring and licensing their vehicles commercially.
To call Uber a ride sharing service is silly... I go to my phone be it a call, text, or an app and order a ride a car shows up and I pay them for a ride this is how a taxi company works.