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Re:Kindle collects a surprisingly large amount of data by crooked-v on Tuesday August 25, 2020 @05:01PM (#24276061)
I believe page location analytics are used for the amount of money that goes to Kindle Unlimited authors, also.

It can't just track the very last page in the book that you read, because authors were gaming that by encouraging people to immediately skip to the last page of very large works they didn't otherwise care about. Instead there's some kind of heuristic that tries to figure out if you've more-or-less-normally read the book.

Re:Kindle collects a surprisingly large amount of data by falcolas on Tuesday August 25, 2020 @05:46PM (#24276544)
A good point, since KU authors are paid per page read. Lots of fraud potential there.