ZNB doesn't seem to be an invite-only anthology small press...

They got 450 submissions recently (per Twitter).

Not currently open to submissions; funded by Kickstarters.

FYI, the author/publisher Joshua Palmatier is on SFF.net. He edits with Patricia Bray; they're listed for several anthologies, including authors like Seanan McGuire, Bradley P. Beaulieu, Jay Lake and Shannon Page, Elizabeth Bear, and Jim Hines...