* Traders/riders on a transaction/ride pay the exchange/Uber for this service.
* Traders/riders are free to trade/ride as much they want to, at any hour of the day, provided there's enough liquidity in the market (surge pricing etc.)
* If a trader doesn't cut a profit on a trade, it's the trader's problem not the exchange's
* If an Uber driver doesn't drive enough to earn a living wage, it's the driver's problem not Uber's.