Two years ago I purchased, on Amazon, Ryan T. Anderson's book When Harry Became Sally: Responding to the Transgender Movement. I'd already read two of Anderson's books. He's a good scholar (degrees from Princeton and Notre Dame), and an excellent writer.
But now, in the spirit of totalitarianism. Amazon has removed When Harry Became Sally. The moral outrage against Amazon has begun - see here.
Meanwhile, Amazon has not removed Adolph Hitler's Mein Kampf. It's their #1 best seller in European political books. One wonders what sort of moral or amoral compass is Amazon navigating by?
"Amazon has yet to comment on its removal of Anderson’s book, which has received acclaim by scholars at institutions like Princeton University, Harvard University, and Oxford University. It was hailed by John Finnis of Oxford as a “focused, informative, fair-minded, lucid and fact-based guide to just and reasonable policies.”" (From here.)
You can purchase Anderson's book at Barnes and Noble where, I understand, it is selling well.