The probably track it to make sure you are not gaming the system. Kindle Unlimited pays out based on pages read. https://kdp.amazon.com/en_US/help/topic/G20154

The probably track it to make sure you are not gaming the system. Kindle Unlimited pays out based on pages read. https://kdp.amazon.com/en_US/help/topic/G201541130 https://kdp.amazon.com/en_US/help/topic/G201541130 > A customer can read your eBook as many times as they like, but we will only pay you for the number of pages read the first time the customer reads them.