> Banning snake oil is never a part of a free society

I mean, sure. But not every trader must therefore carry and sell snake oil. The same free society gives them that choice.

> Who is Amazon, or anyone, to tell someone that they can't explore every avenue, and read whatever they want to deal with that grief?

All they seem to be saying is that they won't be selling it to you? You are certainly free to explore every avenue on your own. But does everyone have to help you with that?