New authors some times try to make things more difficult than they have to be. Things are constantly changing. Companies are taking over other companies. You have to keep up or get lost.

Recently I spoke with an author that had been out of the loop for a while and trying to publish a book and eBook to multiple platforms that was not necessary. 

In my opinion you only need one platform for a print book, either Kindle Direct Publishing ( part of Amazon) or Ingram Spark. Amazon is a retailer with limited distribution. Ingram Spark is a distributor with access to libraries and bookstores. 

For eBooks you want Draft2Digital which is a distributor, one of the largest in the world. It recently acquired Smashwords another giant in the industry. 

D2D occasionally also do audio books through Apple. Here is The Alligator Dance, available for $9.99

https://books.apple.com/us/audiobook/the-alligator-dance/id1704343652

D2D runs specials for holidays where you can promote your title to readers. Put in the work to get the sales.

An author does not have to go to each platform individually and upload their title. A couple well place platforms and you are done.