Direct answer: the main risks and limitations
A privacy-conscious digital nomad should treat a VPN on public Wi‑Fi as a helpful layer—not a guarantee. The main limitations are that a VPN does not automatically provide complete anonymity or prevent every form of tracking or compromise. On top of that, performance and availability can vary widely, and connection problems can make your protection inconsistent in practice.
How it works in this context
On public Wi‑Fi, the risk often begins with uncertainty about the local network environment. A VPN works by sending your traffic through an encrypted tunnel to a VPN endpoint, which can reduce exposure to local observers compared with plain browsing. However, the protection depends on the VPN session being established correctly and maintained without fallback.
A common practical issue is “breaks in the tunnel” during app sleep, network changes, or reconnections. Another is name-resolution behavior (how domain lookups are handled). Even when traffic is tunneled, some misconfigurations or edge cases can lead to unexpected routing.
Practical context: realistic scenarios and impacts
Imagine you’re working from an airport café and switching between Wi‑Fi access points, or tethering briefly and returning. If the VPN reconnects slowly or briefly drops, you may leak traffic during that window. If a website becomes blocked or unreachable, users may assume “VPN failure,” while the real cause could be routing, DNS handling, captive portals, or regional network differences.
Because public Wi‑Fi conditions change over time, you should also expect variability: some networks throttle, some enforce isolation, and some devices behave differently.
Limitations to keep in mind
First, avoid absolute expectations: a VPN does not remove all risk, and it cannot guarantee safety or access in every situation. Second, many “security/privacy” details that matter are not stable across time—implementation and policies can change, and real-world outcomes depend on your device, OS, browser, and the specific network you’re on.
Third, any current product, legal, or empirical claims should be verified using up-to-date, authoritative information.