Guardians of Atlas - what happened?!

I'm a long time RTS player and was SOOOO excited for GoA. The recent alpha footage I saw on YouTube looked great. I was pumped!

I just visited https://www.artillery.com/ and found that it was shut down... I've looked around but cannot find any official word as to why.

Is there any video/blog/etc from anyone (preferably Day9) explains what happened?