It is and afaik always has been available for free
Oh got it. Thanks!
For years I made book versions of the articles on my website. When came time to make the third volume, Amazon threw a massive fit that my books were reusing content!
I ended up abandoning their bookmaking service for Lulu. My books are still for sale on Amazon, but I’m not letting them do anything with the printing.
I ran into this with my first book on Amazon maybe a decade ago. I reused/refined a lot of my blog content as well as some material I published elsewhere. But I sent a bunch of links to show that it was my byline and didn't have any issue going forward.
It's still free on itch.io
It also made front page on HN a while back, maybe 6 months ago?