A Tor client of some sort. Not a VPN per se, but uses the same technique times 1000 to mask your location/ip as it goes through many more routers, thus you still depend on someone else's computers: their willingness to provide you a service (which is kind of a given in a Tor network) and their availability.
Here it says that the app tracks and reports your activity. We usually use a VPN for privacy and anonymity. If the VPN tracks my activities and reports it, what's the point in using it at all ??