On blendermarket I bought the AutoRigPro for Blender plugin… in some of its python scripts code files there is GPL license like this:
It doesn’t mean that the rigging I could make using the plugin is under GPL and I couldn’t export it and use it in any software.
Same goes for the commercial full version Archipack Blender plugin. In its python code files there is the same GPL license block. Along with this one too:
It doesn’t mean that the meshes created with the plugin can’t be redistributed or sold at will.
Many commercial software packages from big software houses include some opensource code under GPL license. That doesn’t mean
that customers aren’t allowed to use the software to create royalty free assets with it and use them to create commercial products.