As far as I have understood, there is no airdrop or bounty campaign. They have even written an article about this topic: https://medium.com/alethena/why-bounty-campaigns-do-more-long-term-harm-than-good-to-the-crypto-ecosystem-153564a059f3

I really hope that they will succeed in "filling up" their project but currently it seems that they have dropped bitcointalk :-(