Usually there's a liquidity pool which acts like a self-service market maker (see Uniswap for details on how it works). Unless everyone pulls their stake from

Usually there's a liquidity pool which acts like a self-service market maker (see Uniswap for details on how it works). Unless everyone pulls their stake from the liquidity pool (it's the same "pull" in rugpull), there is always a counterparty to any sell/buy position.