Well, if customers paid 20% more, both Uber and drivers woould get more. And they would lose appeal compared to táxi, só Uber prefers to earn less and forces drivers to do the same in the fate of market share lol.
Ah, the good old "no one forced him" gig. Yes, no one literally went up to an Uber driver and told them to become one. Same way that no one literally goes up to a homeless immigrant and tells them to steal food [0]. But it's folly to pretend that the "invisible hand" of economics doesn't have a strong part to play in such decisions.