Ah damn, I may be mistaken but I dont think they allow you to put it on other platforms if they are the publisher. Thanks anyway.
I do get it though, as an author you are put in a hard spot since Amazon has cannibalized so much of the book market. I plan to publish my own book eventually and I am sure I will sell 10x less books not being on Amazon, but I have accepted that reality already, I plan to market it on a podcast that I will be building up for 2 years before publishing.