Most all techo travellers will want to take advantage of WiFi networks, to browse the Internet. Some of the WIFI-Free venues are associated with coffee shops and food outlets such as Starbucks or McDonalds, or sometimes airports or libraries.
So if you saw a WiFi network called "Free Public WiFi" when you were travelling, wouldn't you be tempted to connect and give it a try?
Warning, warning will Robinson - Warning Warning!
Image via Wikipedia
Don't. Despite its obvious enticing name, and it being available in many thousands of locations, it doesn't provide Internet access and may compromise your laptop's security.
Whilst connecting to zombie networks isn't harmful by itself, it won't get you connected to the Internet. Worse, it is an ideal way for hackers to gain access to almost anything on your laptop. Some things are too good to be free...