Google faces a massive ethical dilemma. Services like inurl:viewerframe straddle the line between "finding public web pages" and "facilitating voyeurism." While Google removes explicit content, the live streams often don't contain nudity until a user walks into frame.
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Many routers have UPnP enabled by default. When you set up a home camera, it asks the router to open a port to the internet so you can view it remotely. The router complies without telling the user how dangerous this is. Suddenly, your viewerframe is live on the global IPv4 address space. Google faces a massive ethical dilemma