As I imagine, decentralized exchanges are not very popular.
Because there doesn't exist a truly decentralized exchange that is fully functional (or at least in a way described by NVO)? Something which does not exist can not be popular.
What is the specific advantage of this project?
Just read this post:
https://bitcointalk.org/index.php?topic=1917456.msg19224158#msg19224158 (both mine and the user that quoted me).