Awful comparison. GPL is more like a group of people that meet regularly to share cake recipes with the agreement that if anyone has new ideas for those recipes they should share them with whoever they bake cakes for instead of keeping them secret.

And then along comes CakeCompany LTD, complaining that they just want to be part of the group to learn recipes for free without sharing any ideas back, because it would be bad for business, and calling the group a bunch of idiot zealots that are wasting cake recipes by not letting CakeCompany LTD add some nicotine to one of the group's recipes without letting their customers know what their modified recipe is.