The bigger the reward for staking, the greater the number of stakers and the stronger the demand for shorting or selling futures. That’s because staked ether cannot be withdrawn before the next upgrade called Shanghai fork, due in mid-2023, and will earn rewards in ETH, which makes stakers vulnerable to potential ether price slides. Therefore, they will likely hedge their ETH exposure by selling futures contracts tied to ether.
Source: https://www.coindesk.com/markets/2022/09/16/ethereum-merge-has-tied-ether-futures-activity-to-staking-yields-traders-say/?utm_medium=referral&utm_source=rss&utm_campaign=headlines