Facebook changed their policy, a used domain must now have a minimal number of views before it is eligible for Instant Articles. This makes it very complex for us and our partners to support and/or demonstrate FIA. Together with the fact that we didn't see a lot of traction for FIA, this has led to the decision that going forward we will no longer support FIA for both Enterprise Aurora and Inception.
Update 31 October 2018:
Support for FIA has been removed