@posatta is right. There is a disclaimer when uploading your model to the library: Free models can be used be anyone in any way, including claiming that they themselves made the free model. Don’t make your assets a free model/a copied game if you don’t want to allow this.
Anyone can resell this, anyone can claim that this is their creation, and no one has to credit you. All three will be to the courtesy of the user who takes the free model. No one is required to follow any of the agreements.
To summarize: Don’t upload your asset as a free model. Use a different method if you want rights.