You the withdrawal(when it will happen) won't be an individual transaction sending funds from your balance to your receiving address but a batch transaction with output to several other addresses. Exchanges don't like that very much, so it would be safer to withdraw your funds to another address first, belonging to a non-custodial wallet for example, before sending your funds to this exchange. But AFAIK nobody has ever complained from such things. And many people are using FreeBTC for the faucet claims.