Kindle Worlds is not taking off

From The Bookseller:

“Serious content restrictions” at Amazon’s fan fiction platform Kindle Worlds could be a reason why people are not creating as many works on the platform as elsewhere, a new study by Georgetown law professor Rebecca Tushnet said. 

Kindle Worlds allows people to write stories set within certain licensed worlds, such as Hugh Howey’s Silo Saga. When a reader buys a Kindle Worlds book, royalties are paid to both the author and the rightsholders of the world. 

The study, by US law professor Rebecca Tushnet, compared Kindle Worlds to other fan fiction sites and found that Amazon’s total for all 24 worlds it had available in June, after a year of operation, showed 538 works had been created. By contrast, a general search using fanfiction.net’s “Just In” feature, showed Tushnet 100 stories posted across all categories in the hour before her search. 

Meanwhile in June 2014 there were 46 works on Kindle Worlds for the "Pretty Little Liars" TV series, while there were nearly 6,000 for the same series on Fanfiction.net.

Kindle Worlds’ authors receive 20% of the net revenue for works between 5,000 words and 10,000 words, and 35% for works over 10,000 words.