Scary thought ... I've been an Amazon "CUSTOMER SINCE 2000" according to the account page, owned numerous Kindles, bought all sorts of items, watched television shows and movies, bought gifts, etc., from them very regularly for 17 years ... Amazon knows more about me (in some ways) than any friend or family member.
No doubt they do know more about you than you do on a conscious level. We are fast getting into the realm of predictive programs.