It's ridiculous, there's knockoff RC-Monster Slipperentials out there and the purple Castle motor knockoffs that were on ModelsportUK. I forget the name of the company doing the purple Castle knockoffs but they were claiming they were the same motor produced in the same factory. Had a lot of people fooled too since they looked exactly the same except for the color, even had "Castle" lettering on the wires. The only Castle could do was file a complaint in china and threaten legal action against ModelsportUK for distributing counterfeit goods.
FYI Castle motors are made in China by a subsidiary completely owned and controlled by Castle. That subsidiary makes Castle products and that's it. It's in China due to China's high export taxes on raw rare earth metals like neodymium making it impossible to assemble them in the US.