Questions Regarding Bolton Book

If John Bolton got a $2M advance from Simon & Schuster as suggested in this story:

https://www.motherjones.com/politics/2019/11/john-bolton-just-signed-a-multi-million-dollar-book-deal/

Why would he get such a payment up front from the publisher if he had not previously secured permission from the government to disclose the classified details regarding the incidents he planned to include in the book?

Why would Simon & Schuster executives and their legal staff (who had to know that getting clearance to divulge classified information - true or fictional - would be key in getting the book actually approved for wide-spread distribution) fail in requiring such permission be secured up front or at least protect themselves in delaying payment of such advance until the clearance was given? Did they protect themselves, or are they out the full $2M advance with no book to publish?

So, taking this line of thought out to the next level, if Simon & Schuster knew it was more than likely they would not have a book to publish, but paid John Bolton the $2M anyway, why? To get another Trump scandal and potential impeachable offense on record? To hurt Trump during the 2020 election campaign cycle? Was it a whitewashed bribe to get Bolton to create fiction on Trump he was loath to do otherwise?

If Simon & Schuster's motives were not pure in their actions, then did they act as an intermediary to funnel the $2M to Bolton from a third party?

If there was a third party who financed this "leak," who was it?

Suggest the full story on the Bolton book is not yet known and could be "dig-worthy" to some sharp anons.