Because it increases the length of time between your fake product being sold and the return claims/consumers calling shenanigans get you kicked off of the platf

Because it increases the length of time between your fake product being sold and the return claims/consumers calling shenanigans get you kicked off of the platform. If they opened the box and see a brick, or plug it in and only see half a terabyte of capacity, they will immediately start a return. Unless you are the rare type who thoroughly tests all storage you buy before you use it, it is likely you would be backing up data to this and be blissfully unaware of what it is doing until much later, and even then it's likely you'll think of the drive as defective, rather than intentionally sold as fraudulent.