Here are three of questions I have, although I am not an author or publisher, just a reader who doesn't ever buy at Amazon

:
- Does exclusivity extend worldwide, that is, an author can't sign up with, say, Dymocks in Australia even though KDP isn't worldwide?
- Are all participants, or those that Amazon want to participate like the Agency 6, being offered the exact same deal? If not, why not if this is such a sweetheart deal?
- Because an author's income is a percentage of the pot determined by what percentage the author's books represent of all books "borrowed", does an author have the right to audit the whole program to ascertain that the numbers are correct?
Seems to me that the answers to these (and there are other) questions are important to know before signing on, especially as the exclusivity is automatically renewed.