One of the things that drives Reddit as a social media platform is the anonymity.
Once you start tying monetization mechanisms to pay users for content, similar to YouTube or Instagram, you lose the anonymity.
Reddit is already walking the path to destroy everything that made it a different social media platform.
Taxi companies need to own the car, pay for maintenance, pay wages for the driver, insurance, etc.
Ride-sharing apps offload all of the taxi-company maintenance overhead costs to the gig-driver while only paying about 50% of the fare.