&gt; how do you plan to implement that &quot;centralized ride-sharing service&quot; in a city like Cairo (current population 10+ million)<p><a href="https:&#x2F;&#x2F;www.uber.com&#x2F;cities&#x2F;cairo" rel="nofollow">https:&#x2F;&#x2F;www.uber.com&#x2F;cities&#x2F;cairo</a>