I don't like Google but this is not a Big Brother scenario. The videos are hosted on their own servers and are publicly available. They are not snooping on your

I don't like Google but this is not a Big Brother scenario. The videos are hosted on their own servers and are publicly available. They are not snooping on your private videos on your personal hard drive. How could they provide this service without analyzing the content of the videos? The cost of hiring humans to review and classify all of the content uploaded every day is prohibitive.