Malware authors giving you their samples directly, before they ever unleash them into the wild? This seems like a great way to find new malware and 0-days, and a huge wasted opportunity if Google/VirusTotal isn't privately doing this same sort of analysis internally.
I have to take back my previous comment. It looks like VT has to maintain "neutrality" and avoid stepping on any commercial AV companies' toes, in order to get them to cooperate. "The most important rule governing VirusTotal's usage is that none of its publicly offered services/applications should be used in commercial products, commercial services or for any commercial purpose." https://www.virustotal.com/en/about/
