I think turbosquid feel some heat from behind them.
Sketchfab is probably one of their future competitor. Did you seen "sell" question in sketchfab object properties?
That was time when turbosquid was only one on market, now unity/unreal/cryengine have their own marketplaces.
So them will tell more horror stories for protect their business.
And, as James write before. Sketchfab did as much as possible for protect our data. But, there is NO full protection possible, because 3D data is rendered right at user GPU, and this mean user computer already have full 3D information in memory. And only way protect, is made as hard as possible extract data.
BTW, models from Turbosquid or other marketplaces or stock sellers always was is not so hard to find as warez. Or sometime ask corporate friend to download model/image/video for free.