Apparently Amazon initially paid authors by e-book downloaded by users, but some authors abused this model. E.g. by splitting a 300-pages book to 6 50-pages boo

Apparently Amazon initially paid authors by e-book downloaded by users, but some authors abused this model. E.g. by splitting a 300-pages book to 6 50-pages books. It also enabled plain fraud, where fraudsters created accounts to download large numbers of books from Kindle Unlimited paid by unscrupulous authors.