+// A VirtualNetwork may be "secure" or not.
+//
+// A secure VPN is the usual type of VPN that grabs the default route (and thus all user traffic).
+// Only a few privileged UIDs may skip the VPN and go directly to the underlying physical network.
+//
+// A non-secure VPN ("bypassable" VPN) also grabs all user traffic by default. But all apps are
+// permitted to skip it and pick any other network for their connections.