I wonder why the opposite is legal. If users are willing to pay more, Uber/Lyft will not automatically offer more to the drivers. Seems like the free-market works only when it is in favour of the company arbitraging.
The rules of capitalism are specifically designed to drive the price down as low as possible, in the ideal case, to the actual marginal cost of production. That's good for the buyer, bad for the seller, so sellers try all kinds of ways to get around this, some of which are legal (IP protection) and some are not (collusion, price-fixing). If you want to argue that we should change the rules I will not dispute you. But that the moment, that's where things stand.