According to Foresight News, Ethereum co-founder Vitalik Buterin responded to the question of "stop selling ETH" and said, "The ETH sold yesterday was initiated by the funded biodefense organization, and the automatic CoW Swap TWAP (time-weighted average price) order was set on August 29. This is the last order."
Foresight News Note that TWAP is a trading indicator used to help traders manage their positions in the market.