Direct answer to the risk question
A VPN kill switch can reduce the chance of traffic leaving through the wrong path, but it is not a guarantee of anonymity, safety, or always-on connectivity. Users diagnosing or configuring a VPN connection should expect limitations around operating conditions, device/network behavior, and the difference between “what the kill switch is designed to do” and “what happens on your specific setup.”
How a kill switch typically works (and why it can miss edge cases)
Kill switches are generally designed to react to VPN connectivity state changes (for example, when the secure tunnel is not available) by blocking or rerouting traffic. However, their effectiveness depends on multiple assumptions: the device correctly detects tunnel loss, the relevant network interfaces are covered, and applications use the paths the kill switch is meant to control. During troubleshooting, it’s common to discover that some traffic types, DNS behavior, IPv6 behavior, or background network activity can behave differently than expected—especially during transitions such as reconnects, Wi‑Fi roaming, sleep/wake cycles, or network handovers.
Practical context: where problems show up while configuring
When diagnosing a VPN connection, treat kill switch testing as scenario-based rather than one-time. For example, if your device switches networks, the VPN reconnects, or the system temporarily suspends networking, the kill switch logic may not behave exactly as it does during stable “connected” periods. Performance and availability can also vary by network quality, device capabilities, location, provider infrastructure, and time, which can create symptoms that look like kill switch failures but are really connectivity variability.
Limitations to keep in mind
First, stable general knowledge: a VPN does not inherently guarantee anonymity or safety, and no kill switch eliminates all risks in every scenario. Second, kill switch behavior is often product- and configuration-dependent, meaning documentation and settings matter—and outdated assumptions can lead to incorrect conclusions. Third, some claims about specific features, coverage, or testing results require current verification from authoritative, up-to-date sources.