1. Of the literally hundreds of maps on his site, there are only two which are actually based on Middle Earth.
2. 'Style' is not copyrightable. No one owes royalties to Picasso for Cubism.
3. Plagiarism is representing someone else's work as your own. The tag line of his site is literally "Tolkien Inspired Cartography". He's very clear that he's following Tolkien's style.
4. Tolkien borrowed from previous cartographers, his own style evolved considerably over time and what you probably think of as the iconic Tolkien map, was actually by Pauline Baynes.
Would someone who paints photographs for you in the style of Van Gogh's Starry Night also be "cheap?"
Particularly if their website were called "StarryNightPhotos.com" and they clearly said on their site "these are painted in the style of Van Gogh?"
Because that's all this is. And there are plenty of AI sites that do exactly what I just said but poorly, and probably plenty of artists with a side-job of doing something like that better.
2. 'Style' is not copyrightable. No one owes royalties to Picasso for Cubism.
3. Plagiarism is representing someone else's work as your own. The tag line of his site is literally "Tolkien Inspired Cartography". He's very clear that he's following Tolkien's style.
4. Tolkien borrowed from previous cartographers, his own style evolved considerably over time and what you probably think of as the iconic Tolkien map, was actually by Pauline Baynes.