[geekmaster]

Sadly, most routers have vulnerabilities letting you crack their encryption if you harvest enough data, and many use a default encryption key based on the broadcast MAC address in metadata that is not even encrypted. Google has a huge amount of raw wifi traffic they harvested while doing their Street View "drive-by"s (which have much higher resolution photos taken much closer together, which they do NOT share with the public). Except in countries like Germany, perhaps, but certainly in the US, google can see what we were doing on wifi when they drove by.

And BTW, in a Google Street view image of my house awhile ago, I could see somebody standing next to a side window (far from the street), leaning against it with hands over eyebrows (to block reflections) and looking inside our house -- creepy...