GNUstep being LGPL has as much adverse impact on developers as Apple's implementation being proprietary. (I.e., none.) It's the _LGPL_ after all, not the GPL.
GNUstep has also moved to GitHub and seems to favor the the MIT license nowadays where possible (e.g., libobjc2)[1][2].
GNUstep has also moved to GitHub and seems to favor the the MIT license nowadays where possible (e.g., libobjc2)[1][2].
1. https://github.com/gnustep/libobjc2
2. http://etoileos.com/dev/licensing/