Ethereum co-founder Vitalik Buterin commented on Tesla CEO Elon Musk’s remarks on Twitter Blue’s subscription fee of $8 per month, saying that how well this works depends on exactly how much due diligence is done to make sure blue checks are who they say they are. "Pay $8/month and call yourself whatever" would damage the blue check's anti-scam role. But if there's more actual verification, the result is very different.