[andyjohnson0]

I have some of these hardcover pod books, authored by qntm [1] and their website points to Amazon as a supplier. So I assume its legitimate in that case.

I also have Andriy Burkov's Hundred-Page Machine Learning Book in pod paperback, and the author advises buying it from Amazon to avoid scammers profiting from repackaging the open source content. So again, apparently legit.

The books themselves seem of decent quality - not as good as a sewn hardback binding, but perfectly good. Interestingly they have a guid printed on the final page which I suspect is unique to the physical book.

The ones I have come from Poland. As I'm in the UK, the potential for reducing book-miles is maybe not being realised yet.

[1] https://qntm.org/fiction