TerriBull
Members of the family who work in publishing have said it is hugely damaging to an author not to have their book available on Amazon.
I do understand that, because Amazon has put itself into this 'go to' position. After all, it did start off selling books and CD/DVDs IIRC.
But if I want a particular book I will always look at all the online bookshops for it, and I usually find it. If it is only available on Amazon, I won't buy it (sorry, authors).
I'm finding the idea that there is only a choice of either Amazon or High Street shops quite puzzling. You can source just about anything on line without going near Amazon, but still seated in front of your computer (or scrolling on your phone).