Poolin users had been complaining about issues withdrawing from their Poolin wallets since at least August, which had sparked rumors of liquidity problems prior to the announcement. Poolin said in their announcement that they would announce their plans to resume withdrawals within two weeks.
PoolinWallet is a crypto wallet service provided by Poolin, which runs the fourth-largest Bitcoin mining pool and third-largest Ethereum mining pool in the world. In the announcement they wrote that "Poolin Wallet is currently facing some liquidity problems due to recent increasing demands on withdrawals. But please be assured, all user assets are safe and the company's net worth is positive." The firm also urged users to ignore rumors of a rug pull.