There are several reasons why "ripper" tools end up on GitHub:
Some repositories are not "rippers" at all, but rather basic HTTP scrapers. They attempt to download the compressed .zip file from a direct purchase link. Without a valid session token (purchased account), these return a 403 Forbidden error. cgtrader ripper github
Finding out your $200 premium model is being distributed for free via a link generated by a GitHub ripper is devastating. This leads to: There are several reasons why "ripper" tools end
used to automatically download free 3D models from CGTrader. Stansim Issue #3 : A discussion on cgtrader ripper github