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Hello! Network Lock, which has been implemented for the first time "in history" of software for VPN by AirVPN in 2011/2012, covers all the limited cases foreseen by a kill switch and many more for which a kill switch is impotent. A kill switch features a very modest subset of Network Lock abilities to prevent traffic leaks outside the tunnel which are covered in any case by Network Lock with a more effective method (firewall rules). In other words, a kill switch is a totally wrong approach to prevent traffic leaks outside the tunnel, and anyway its limited abilities to fulfill leak prevention are fully covered by Network Lock. Kind regards