Dear FAB.COM
From the begining of your life i would ask you to take proper care of assets copyrights.
I am long time user of Sketchfab selling my own assets. But in time Sketchfab become ripper heaven. Many people are just skilled to rip 3D models from the games and upload them free of charge on Sketchfab. Ripping is stealing.
Please minimize this and if someone uploads any 3D assets make sure he comply with copyrights regulations. They have to confirm that assets are theirs or they have all the rights to manage them. Otherwise in time you will support thieves, not creators.
Thanls for understanding.