I only know a bit of the story. I don’t think Ernest has done anything wrong, per se, but I don’t think he was prepared for the Reddit migration. He put in a ton of time and work and seems to have gotten burned out. It’s still missing some pretty basic features.
For instance, I know kbin doesn’t have api support, so apps like Artemis are unable to plug in and use it effectively. It sounds like mbin is already further along on that front.
I think the original vision of kbin sounds really cool. It’s basically a tighter integration with Mastadon while maintaining a more reddit-like feel and foundation.
I’ll be curious to see where it goes in the future and wish all the developers well. For now, it looks like mbin is the path forward.