I know a few of us are published authors here, including Jonah and Tristan.
As a published author, I have distributed my book on self-publishing platforms in the form of an audiobook, an ebook, and a physical copy.
I have found my book being pirated on eBay.
Please make sure to do a search of your copyrighted works on the internet often. I'm now having to deal with a bunch of legal issues. And it's going to be a MESS to get cleaned up.
Sorry, I know this doesn't have to do with TTRPG directly; however, I just wanted to warn my fellow published authors in our group that even if your book isn't really popular or well-known, it can still be pirated, and as self-published authors, we have to do our own legal footwork.