The wider context here is really worrying and echoes the patterns seen where both mainstream media and social media are banning and censoring critical voices on gender, on coronavirus and on other issues where only the approved viewpoint is allowed.
As a British commentator, Richie Allen, points out:
"Amazon will soon be the only place left where you can buy a physical book, or the equivalent digital download. The High Street is dead. Amazon, not coronavirus, has killed it. Amazon will have total control of what you can and cannot read. It goes without saying that the implications for free speech are unthinkable."
richieallen.co.uk/book-burning-amazon-pulls-book-that-criticises-transgender-movement/
A comment in response on that page claims " I think Amazon are buying up stocks of a lot of things because when you look on other sites they are not available or out of stock.“
I can imagine that this might well be true — if so, the consequences are even worse for free speech and free thought than those of a simple ban.