There's been a lot of talk about Kindle Worlds lately, and the OTW has received some questions about its legal implications. The OTW has long maintained that noncommercial fan fiction is fair use, and Amazon's new program does not change that in any way. It also doesn't change anything about the AO3's continued mission to provide a permanent platform for noncommercial fan fiction. (And don't forget, works on the AO3 are readable on the Kindle and other handheld platforms.)
So should fan writers put their works on Kindle Worlds? That is, of course, up to you. We believe that every author should make up their own mind about whether they want to publish their work on a particular platform. However, we also believe that every person should have a full understanding of the terms they are agreeing to by doing so. We've reviewed the information Amazon has made available to date, and have tried to explain the practical implications in this post.