They wouldn't even have to have a person Google them. They could just compare author and title to their own print catalog and look for things similar. I've seen a pirate copy where they slightly misspelled both author name and title so exact match wouldn't be good enough. Their own search engine on the site is good at accommodating this, though. While this wouldn't catch more obscure works, as rlauzon says, it would catch the most attractive targets which are probably the biggest liability as well. It's also a tool that would be quick to implement. No need to make the perfect the enemy of the good when they can certainly improve the system over time.
As for validating the uploader, can someone fill me in on what they do now? I wonder if there is a way they can mandate and enforce that the uploader has an active account at a US financial institution tied to the Amazon account? That might be a big disincentive since that's rather more traceable.
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