Wu said he learned that Grayscale sent 4k BTC worth $183 million to the Coinbase Prime deposit address 2 hours ago. The current fee for Grayscale's spot Bitcoin ETF is 1.5%, which is much higher than the fee set by other issuers (around 0.25%), and current spot Bitcoin ETF subscriptions and redemptions must be completed in cash. Therefore, Grayscale’s behavior may be investors switching their assets from Grayscale Spot Bitcoin ETF to other ETFs or selling them normally.