No place for Amazon books with superheroes?

I have a friend that made four books on Amazon with superheroes, and yet no thread with Amazon books.

MY Friend's books are...

[url]https://www.amazon.com/Shadow-Killer-Michael-Underwood-ebook/dp/B01JVFKK54[/url]

[url]https://www.amazon.com/Shadow-Killer-Dance-Michael-Underwood-ebook/dp/B072MXKTMB[/url]

[url]https://www.amazon.com/Shadow-Killer-Runners-Michael-Underwood-ebook/dp/B08FJGGMWM[/url]

[url]https://www.amazon.com/Marcus-Intergalactic-Man-Michael-Underwood-ebook/dp/B08K4X8DBT[/url]

Add your own Amazon books if you want? :D

Amazon books like everything Amazon can only make their way with reviews.