Ethereum co-founder, Vitalik Buterin, has expressed concerns about WorldCoin's proof-of-personhood system as the cryptocurrency goes live on Binance. Buterin highlighted the importance of proof of personhood in preventing manipulation of decentralized governance by wealthy actors and hostile governments. He pointed out potential risks associated with government-backed identity systems, including privacy breaches, limited accessibility, potential centralization, and security vulnerabilities. He also suggested that a combination of different approaches may be the most effective solution.