I've had this happen to me too many times to count. We have open modding permissions, but there are a few simple restrictions...I ask that the original readme be included, the original mesh maker be consulted and permissions secured (the biggest offense...just because I say yes does not mean one can tromp all over LC or Moonraker...they built the mesh, they deserve thier fair share of the credit.), and the models not be used in any for-profit product. Finally, NOONE can restrict usage of our meshes if they do a kitbash based on it, period. If you use our design to make your model, anyone can bash it, but they have to follow our original requirements. Simple.
It seems that people decide that open release means open party. We dont have to release this stuff for free guys. Even the guys that dont actually build the models...I used to be one of them, just designed the concepts, Atolm was one too....we at least deserve some kind of nod.
I hope you will reconsider, but I understand your frustration and feel your pain.