In 2010, Google's Street View cars had been extracting private information from insecure personal Wi-Fi networks for approximately three years. Google tried very hard to downplay it, initially denied that it collected any payload data, later admitted it had collected data "mistakenly," Google's latest response: Google would like to delete the remaining data, but gave local authorities the option to look at the data before it was destroyed (hence the data was kept).
And according to Google, it all happened under the radar, and as soon as it found out about, it fessed up, apologised and promised to delete all the questionable data. Turns out Google didn’t.
In June 2012, UK's Information Commissioner Office (ICO) found out that Google collected sensitive personal information from unsuspecting households deliberately, not just a simple mistake as Google claimed back in 2010.