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Is an artist allowed to advertise their contact details for another site (Telegram) in the model description? The rules say that it is not allowed for sales purposes outside of CGTrader, but since the models are free...
It doesn't matter, free or not.
The user in question is doing it on a few of their models. https://www.cgtrader.com/free-3d-print-models/jewelry/rings/the-best-tango-men-ring-4bc5591e-a71f-4520-aa27-4aca18ffacfa