I suspect that Kindle Worlds would do more than open a can of worms.
With that can worms being opened. It would pose huge problems for self published authors. Doing some damage to a self-pub authors. Self-published authors are basically on their own. Hell, a good number of them can’t afford decent lawyers.
A fan fiction writer who has no scruples, won’t have problem in stooping low by taking short cuts. He/she would lift or steal source materials from a self-published author’s book. Pass it on as part of his/her fan fiction material.
(Lifting source material from someone else’s unrelated fiction and passing it on as their own fan fiction of his/her favourite author’s work.) Ergo amazon publishing could nix the book written by an author of the original material, world and intellectual property. Citing infringement.
That aspect had me thinking. It could snowball from there. It also mean that particular fan fiction could knock a self-published author’s hard work back to square one. Let say that Alloy entertainment or some other company like that element of that story and decided to use it for their TV shows and novels. Giving them full rights of that stories and world that belong to the original author, by default. The original author would lose by default. They, the ones who gain intellectual property of another, by default, would contact amazon publishing and demand that author’s intellectual property be removed. For infringement of their intellectual property.
You see where I’m getting at. You can forget demanding compensation for loss of one’s hard work. The courts won’t side with you. In essence, you would get ridiculed by other authors and fandom of other works.
On a closing note, I hope I am just being paranoid or whiffing out suspicions in the air.