Unfortunately the first link doesn't appear to direct correctly. I'm still willing to think 500M is plausible, with Uber Black and SUV included (is it safe to say these professional drivers make more than 3000/mo on Uber?). Even if it's not quite 500M, or maybe they needed to flub the geography or numbers to get to that number, they're still generating huge sums of revenue in what is only one large metropolitan city out of hundreds around the world.