Pseudonymous Bitcoin stock-to-flow (S2F) model creator PlanB criticized Ethereum, calling it a “centralized & premined” cryptocurrency. PlanB mocked Ethereum’s co-founder, Vitalik Buterin, in response to Buterin’s past criticism of the S2F model. PlanB highlighted Ethereum’s shift to proof-of-stake (PoS) and changes in its issuance rate as reasons for his criticism, stating that these features are harmful and deserving of mockery. The debate between the Bitcoin and Ethereum communities regarding full nodes was also touched upon, with PlanB pointing out the resource-intensive nature of running an Ethereum full node compared to a Bitcoin full node. PlanB questioned Buterin’s influence on Ethereum’s development, referring to him as a “single point of failure.” Despite the criticism, Ethereum developers are actively working to address centralization issues and improve the network. The article also discusses the possibility of Ethereum rolling back transactions and compares it to Bitcoin’s history of blockchain rollbacks. PlanB suggested that Ethereum’s switch to PoS and changes in issuance and governance could affect its value proposition compared to Bitcoin’s supply predictability. In conclusion, the article emphasizes the differing purposes of Bitcoin and Ethereum, with both cryptocurrencies playing essential roles in the crypto ecosystem.