Here's me sporting a hardcover and a paper back of Road Brother - the American edition.
These are ARCs (Advance Review/Reader Copies) that Amazon will send an author to check that the end product is satisfactory.
This all happens through KDP (Kindle Direct Publishing) for authors who are self-publishing something.
I self-publish Road Brothers in the US because it's more profitable for me to do so, and my US publishers have never requested that I let them do it (which is what happened in the UK).
The bots want me to produced 14 separate contracts, all a decade or so old, to prove that the anthologies that these stories went into did then release the rights a year or two later.