I think c trader is a very questionable site.
Too many users with hundreds of high quality content (both free and paid)
I would expect much more low and mid quality uploads, as you see in any other place where hobby people upload their creations.
For example YouTube: wide range of quality. Good stuff and bad stuff, anything in-between.
If you are surfing on a website that only shares high quality movies...then it is warez and you are a pirate.
I see no efforts by cgtrader to control what gets uploaded.