Little late, but I just noticed they, with the infamous automatic change of licenses, also in silence updated their Terms & Conditions with this:
18.5. For any Product/Content uploaded to the Site or otherwise submitted to CGTrader, the Seller grants and represents that he has the authority to grant to CGTrader a non-exclusive, worldwide, royalty-free, license in any medium now known or hereinafter invented to:
- use the Products for machine learning or training of neural network models, including generative AI, for the purposes of researching, creating, developing and testing new CGTrader's tools, features, services or technologies, which may be developed by CGTrader or with the help of its subcontractors or partners, unless the Seller opted out by licensing the Product offered for purchase under the licenses marked with “No AI”, while CGTrader shall always retain this license for Products offered as free download. The Seller explicitly agrees that any such technologies, tools, software, data bases, trained neural network models, their developments, modifications or improvements shall exclusively belong to CGTrader alone or with its partners to the full extent possible. We may compensate you at our own discretion.
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So yeah, if you don't use NO AI license you are giving your models to CGT and it's partners for free.
Also since they changed the licenses to all models and forced us to change it back they had legal opportunity to use all models on this site, no matter if you agreed with it or not.