Chris Rawson and Angelina Stanzione, both 28, searched for popular topics on Amazon's Kindle Direct Publishing and used ghostwriters — and later AI— to draft their nonfiction books.

Amazon has revealed some interesting facts ... It has also been a boon for the Kindle Direct Publishing authors who have made £2.66 billion ($3.5 billion) from the service so far.

Kindle allows you to do that if you are exclusive to Kindle Direct Publishing. There are also ... A total of 41,000 copies were downloaded from Amazon alone. I was stunned. I had no idea that ...

it said Vella was a way for readers to discover new fictional stories and a new way for authors to earn from the Kindle ...