That doesn't make sense. You do not need to show publicly the name of a person who uploaded a specific file. This does not do anything for you regarding copyright material.

What it does do however is cause people who are malicious that would know the name of the account of who's uploaded certain files to cause trouble for that account intentionally for the rest of the files they know are uploaded by that account holder.

Trust me, every host around does not display the account name of an uploader to downloaders. I'm not saying condone piracy, I'm saying protect your uploaders from malicious downloaders.