Uber and Careem are the only two service providers in my country (Pakistan); before Uber entered, the prices were quite high because Careem had no competition and they cashed in their monopoly. Uber entered the market and caused a price war driving prices per km down significantly and causing both providers to add new features to cater for the local market as well. However, Uber is usually thought to have a low quality of service here; drivers on their network quite literally abuse the platform; they will refuse to drive to the destination if they don't want to go there; they will use tactics to get the ride transferred from them if it's not profitable enough for them. The end result is that the customer receives a slightly cheaper but vastly inferior service from Uber. Compared to this, Careem's quality assurance and customer care is a winner.
With Uber buying Careem and eliminating competition, I can't imagine how much pain it is going to be to call a ride now, if they absorb Careem's customer-base completely and close its app. I thought there were anti-competition laws that prevented this from happening; I guess they don't apply if both the companies are foreign and the deal is happening overseas.