Do your neighbors have open Wi-Fi? I'm a country dweller, but when I'm in town I look at the Wi-Fi list (in horror) sometimes, and it's really rare to see an open Wi-Fi network.

Anecdotal but my laptop just found 2 open WiFi networks out of 20. One's enough though.

Are they truly open, or are they captive portals? Of course, it might be possible to exfiltrate data through a captive portal network, depending on how they implement the portal.

It’s a common fear. People constantly mention it on HN every time the advice to keep a TV off the internet is mentioned. Yet we have never seen proof by anyone, not once, that it has happened. Extraordinary claims require extraordinary evidence.

That would be a lawsuit waiting.