GH is shooting its own foot here. The fact this is the first issue discussed before Atom has even been made public makes me think we'll see a lot of backlash. Eventually GH will cave in and release it under proper license, so why upset everyone in the first place? Some of GH's appeal relies in its image as a dev-friendly, "cool" company.

Now, as for Atom, they don't need to worry about forking when its opensourced, as GH's branding and integration with the present GH functionality will likely to deter most from using forks.