Robinhood's testnet has achieved four million transactions within its first week of operation, according to CEO Vlad Tenev. The Robinhood Chain, designed for tokenization and trading, is part of a trend where centralized exchanges are developing their own blockchain infrastructure. This development comes as Ethereum co-founder Vitalik Buterin questions the viability of Ethereum's layer-2 (L2) rollup-centric roadmap, citing issues with decentralization and unexpected base layer scaling. The Robinhood Chain's testnet launch highlights a growing divide in the crypto industry. While Ethereum's community debates future scaling and decentralization, centralized platforms like Robinhood are focusing on proprietary chains to enhance user engagement and liquidity. This strategic move by exchanges could lead to tighter user control and new revenue opportunities, contrasting with Ethereum's evolving approach to scaling.