Not necessarily! `SCNetworkReachability` is deeply integrated within macOS, and is able to tell you very quickly whether e.g. the user has just roamed from one

Not necessarily! `SCNetworkReachability` is deeply integrated within macOS, and is able to tell you very quickly whether e.g. the user has just roamed from one type of network to another: https://developer.apple.com/documentation/systemconfiguration/scnetworkreachabilityflags?language=objc https://developer.apple.com/documentation/systemconfiguratio... Even if you just went and turned off the Wi-Fi interface on your device, `SCNetworkReachability` would know straight away - and from the flags you can deduce exactly what happened and react accordingly. (I do agree though that it's a dangerous approach if it misbehaves, as it happened to me!)