I'm for the concept of a lore project, but not so much on yours receiving the official seal of approval. This is basically trying to legitimize fanfiction into canon (which on basis of fanfic can be pretty bad.) A writing contest sounds fun though. Maybe the best stories become official lore?
On the topic of writing Splinterlands fanfic, it's crossed the mind a few times, but I think you have to go rather out of your way for the existing lore of Splinterlands. And I've yet to bother to do that.
Thanks, I think? lol. I'm not trying to legitimize anything I just want to do what I enjoy and hopefully others will enjoy it too!
If it was just doing what you enjoy - you don't need to advertise to the community to write a fanfic centered around Splinterlands. This post translates to <I want to write a story, please make it official too.>