I just finished my latest 3D model and published it on CG Trader. I found i was unable to place 3D viewer link on model description, which i was use to do... Then i browsed the forums and i found thread where people from CG Trader say it is possible to steal models from sketchfab (even without permission to download), so they disabled possiblity of adding 3D viewer. Then i googled it, and found various threads
in which people ask and get explanations on how to steal models from sketchfab, as if that is common thing.. This thread for example: https://facepunch.com/showthread.php?t=1536866
If true, this is serious problem for me, and i'm even considering removing all models from sketchfab.