The issue was never with the GPL. We know enough about licensing to know that you should stay away as far as possible from anything licensed under the GPL.
The issue is that the L-GPL, while being more open for commercial use has a clause that requires you to distribute a license to it even when you just dynamically link to it (as we did). From discussions, hardly anyone knows about this - I’m surprised that not more software gets flagged.
Anyway, we are getting close to a linux release now. Just a few technical tests outstanding.