Hello,
friend of mine his account has been suspended without notification and by the way you can't proof any model you have designed as yours check EVERMOTION it self they made a competition every year and they tell you to upload step by step your idea drafts and your materials and your model progress then your renders and your final model so after that they give a random employee from there team the prize and tell you nice job next time you will win after that you see your design's go on there collections for sell wow what an amazing pirates they are. So you tell me how you can proof that is your design when they have all things from drafts to the final model if you can answer that well you can proof pirates because the right way to deal with that issue you tell the suspicious designer to confirm that every model has been reported as stolen is his model and give him a period of time to confirm or remove them, therefore if he already sold some of them your website has already gain your cut from the sale so if you just closed his account it dos't matter for you because you already got your money but if you can retrieve the item and repay the buyers the money you have been recharged them then you take action with the pirates anyway he tells you your the pirates
Regards,
Mr Nice Guy