Institutions want their own rules inside Ethereum blocks. A normal transaction on Ethereum is visible to everyone before it is included. That has pushed many institutions onto private chains with far less liquidity. @ETHGasOfficial lets them book space in Ethereum blocks ahead of time. Transactions sent this way skip the public mempool and are screened against the institution’s own sanctions rules first. Each institution stays in control of its transactions without leaving Ethereum. Being seen early is expensive for a fund moving a large position. Traders watching the public mempool can spot the trade and buy first, which pushes up the price the fund pays. With reserved blockspace, the fund can buy a whole block and decide what goes ahead of its trade. Institutions do not have to leave Ethereum for a private chain to set their own rules.