Google is petitioning the Supreme Court to dismiss one of the Google Street View lawsuits.
Google Street View vehicles would scan unencrypted and open Wifi networks to help find the Street View cars location, which led to cries of privacy violations, and ultimately lawsuits.
While the FCC cleared them of any unlawful activity, a class-action lawsuit was pushed forward. Google is asking the Supreme Court to stop the lawsuit and have the charges dropped.
We're not the Supreme Court, and therefore not able to determine the validity of any of these claims, but we can suggest that if you protect your Wifi network on your own it can prevent anything like this from happening.