Your question is welcome! Since the launch of 3DNes i already run a survey;
https://goo.gl/forms/f0B4H1zXEbFIBbIJ3
and ~98% Mac and Linux users who participated in the survey are willing to pay a few bucks to get the native 3DNes build for their OS. I know after all it's still unfair for them. Let's see it as a temporary price model. In the future when 3DNes support more advanced features (like virtual reality for example) there will be two versions Free and Paid for all OSs users.
Thank you for your interest and understanding!