Ethereum doesn't currently require a "contract annual review" mechanism to address resource waste from zombie contracts. These are inactive smart contracts that consume network resources like storage and gas. Implementing a review could involve periodic audits to identify and deactivate such contracts, freeing up space and reducing bloat. However, this raises concerns about decentralization, as it may require centralized oversight or consensus on deactivation criteria. Alternatives like gas refunds for self-destructing contracts or storage rent have been proposed but face challenges in implementation and fairness. While zombie contracts do strain Ethereum's scalability, the network's design prioritizes immutability, making mandatory reviews contentious. Solutions must balance efficiency with Ethereum's core principles.