Silicon Valley venture capitalist Mark Anderson forwarded a screenshot of an email from OpenAI co-founder Ilya Sutskever. Steven Sinofsky, former Microsoft executive and current board partner of venture capital firm Andreessen Horowitz, commented: "This is a classic argument against open source related to security. The idea that open source is insecure because 'bad guys' can see the source code to exploit weaknesses. Closed source can prevent this. This is completely wrong." Anderson responded: "The safest software in the world is open source. Most people pay attention and most bugs are fixed. QED (proof complete)." Musk responded: "Absolutely true."