[belorn]

Security in this space is based on reputation and trust. Users and groups who has a long history of uploading files with no malware is more trusted than freshly created accounts.

To make a analogy, imagine a world where there existed no government food inspectors. I would expect that visiting restaurants would become more dangerous, but my behavior would also change. I would only visit established places where people before me have eaten and proven that the food aren't poisonous.