Earlier quoted context omitted.
He should just sue for copyright infringement.
IIRC: Amazon won't tell him who it is and he suspects it's just someone out of legal reach / as the book is just self published his legal resources are pretty limited.
Fraud.
I remember when people used to (heck still do) get worked up about Walmart but those same people not only order from Amazon all the time, they even join B mans private club (Prime).