The primary difference between a home DM and a published DM is a piece of paper. Or nowadays, a PDF. That piece of paper or that PDF is no guarantee that they're any better than a home DM; they just went to Canva and spit something out.
That's how I entered the Cabin Fever jam for Pirate Borg. And that entry, while not in the big Cabin Fever book, has gone on to make me about $50 across itch and DriveThruRPG and was something I do for fun anyway, just with some fun public domain graphics slapped on it.