A few years ago, we wrote about why, for many years, whenever you were in a public place like an airport or a hotel, you‘d often see an available WiFi option called Free Public WiFi — though if you looked carefully, it was an ad hoc (computer-to-computer) network, rather than to a WiFi access point. It turns out that it was because of a stupid bug in Windows XP, which also explains why it‘s a lot less common these days. Of course, some people always would joke that it was really spy agencies trying to get you to connect to their WiFi. Except, that might not be that much of a joke.