Ethereum, Blockchain, Layer 2, Zkrollup.
Currently, even Arbitrum (the most used L2) trails alternative L1s like Solana and Harmony in user count. https://solanabeach.io/supply, https://andromeda-explorer.metis.io/, https://blockexplorer.boba.network/, https://explorer.harmony.one/ “zk-rollup” became a buzz word on crypto twitter in late