[6stringmerc]

IIRC the rules regarding income get fuzzy when basing one's written work on the Intellectual Property of another entity. As in a "Minecraft story" revenue would likely default to the owner of the IP, not the unaffiliated writer. If the entity such as Minecraft reaches an agreement to give the writer of the derivative content compensation, I think that's their choice (e.g. they never hired the writer and are allowed control of their IP, which can include take-downs). There's a lot of good publicity to be earned by including fan-works into a global campaign, for sure! Also, money! See: "50 Shades of Grey" and its relationship to "Twilight" being a way where both parties became fiscal winners.