Back in 2010 we went through exercise of first using a local data center and then using a CDN in a different country. Interestingly enough using a remote CDN had much smaller latency. After doing an in depth analysis this is what we discovered. There are two factors that influence your latency...
They are getting interest through their traction in other cities. Since they are already in 20 cities and have approximately half a million users if you look at their Android app (https://play.google.com/store/apps/details?id=co.hinge.mobile.android), they can simply wait until one city "tips". ...