XtraFinder is awesome but...

I find it strange that an app as awesome as XtraFinder isn't available on Mac App Store. I know that many really, really great apps aren't on the Mac App Store but what's more intriguing is the fact that the developer doesn't accept donations too. The developer's name sounds like he's form China. Is it just my imagination is XtraFinder packed with something that the Mac App Store might reject? Thoughts please.