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That's the nice thing about using the search engine caches, it means amazon is not touched at all (well covers are still downloaded from amazons servers, but that's it. Expensive queries that touch databases are avoided). This does mean that ratings for some books maybe a little out of date.
calibre's metadata fetching system is not really a bot. It runs only when asked to run by an actual human and makes targeted queries for the book in question. It does not indiscriminately scrape sites. It also goes out of its way to make sure it throttles all interaction with the servers it queries so as not to overload them.
The other default metadata plugin, that queries google books has never had any issues with google, it's a shame that Amazon does not distinguish between responsible uses of their website and bad actors. But, such is the world, we do what we can...
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