I am using OverDrive it is used in many USA libraries. It is the Publisher, not Amazon that is doing this. I have used a plug in on calibre which does not work
If you have a suggestion of how to convert this - from ePUB to MOBI, fine, Otherwise, telling me what Amazon does/does not do does not provide a solution.
I use a Kindle, enjoy it and up to know have had no problem with borrowing books in the last 18 months. I have converted ePUB to MOBI numerous times with no issue