Why is everyone assuming that a cheater will only do a "quick web search"? You could call someone to walk you through it over Skype, or get a person to solve it over remote desktop, or even have a friend sit in and do it for you, etc.
These are the cases where monitoring is needed. Whether or not what Amazon is doing is actually effective is another issue entirely. All I'm saying is that it's not as huge a deal as a lot of people on this thread are making it out to be.