Yes. That's unfortunately how internet business work these days, use 'strategy' to dominate the market, and it has the power to dictate terms and profit from it. Although Walmart market dominance are protected with the shops and locations they own, apps such as Uber or Doordash where it is mainly a utility, the market dominance is not protected in any way. Once they start to charge more to make a profit, consumer can always go for an alternative app for it.