An Uber driver told me about this. A lot of parents violate the TOS and have their kids take Uber. The drivers can usually tell because they are asked to pick up near a school. He stopped taking kids and the app would normally penalize him for refusing too many rides.

But, he was the one of the few drivers in that region during the daytime so the app warns, but does nothing.

Not sure of penalties, but I know one of the food delivery apps promotes you in tiers based on how many good delivers you do within a time frame.