This topic was touched on previously here https://community.ricksteves.com/travel-forum/tourist-scams/a-i-generated-guidebooks-scam-online but it's absolutely worth a bump due to the massive proliferation of these types of useless travel guides flooding social media and Amazon
I was first made aware when a fellow user of a Facebook travel page mentioned a "really awesome guidebook" he had come across about Vietnam. It sounded great, and here was a fellow traveler saying he had used the book and loved it. So I searched amazon and there it was.. and lo and behold the author had other guidebooks - Venice, the Italian Riviera, Spain, Amsterdam, Bath England, Glasgow, and Phoenix?? Just a weird combo of destinations and the books either had no reviews or very low reviews. I clicked on samples in them and they all had the same weird stilted language, very short, surface-y content and no original photos.
"Carolyn B Mathis", "Betty Caulfield" and maybe the most prolific "author", "Roy McKean" are good examples of this brand of useless guidebook.