GNUStep is not current with the frameworks that it corresponds to on macOS (and was never complete).
Those frameworks are also a tiny part of the full set that you need to build non-trivial software on macOS.
Audio? Video? so much more stuff that nobody has ever tried to reimplement the APIs for.
Yes, such a reimplementation would be legal,but Wine has been a project for 20+ years and has a huge headstart compared to any idea of doing this for macOS.
Those frameworks are also a tiny part of the full set that you need to build non-trivial software on macOS.
Audio? Video? so much more stuff that nobody has ever tried to reimplement the APIs for.
Yes, such a reimplementation would be legal,but Wine has been a project for 20+ years and has a huge headstart compared to any idea of doing this for macOS.