Why did the institutions keep buying so much last week, and today ETH is still falling?

PANews August 18 news, according to Lookonchain report, in the past week, institutional capital has surged in, purchasing a total of $4.7 billion worth of Ethereum (ETH), and the market cap of stablecoins increased by $6.72 billion, with USDT and USDC on Ethereum growing by $4.46 billion.