Uber drivers get kicked off Uber if they do it too often. They might have the same incentives but the platform at least helps prevent it.

The frustrating part about Uber is that I have to wait 10 minutes for each one before they refuse to take me somewhere. With a taxi I can just walk down the row of taxis at the airport. On the other hand, the only reason taxis can get that benefit is because they lobby so hard to kick the Ubers out to a parking lot 10 minutes away.