I’ve seen some discussions in threads regarding this topic. Apparently, after reading a specific amount of episodes in the community stories (3 chapters) you’ll be given the choice to either wait a week to further read the story, or you’ll have to pay 8 gems to directly read it.
I’m not quite sure if this is the true information, but I’ve read that it’s a beta-testing that will only be visible for a specific amount of players at the moment.
Does anyone know if this is a final decision and if they’ll roll on the change to the rest of the community? What do you think of this change? 
Apparently, some stories won’t be available fully for free, therefore you’ll have to pay to get full access.