that's how the automated deposita work on any Centralized exchange. the smart contract is automatically moving the crypto from your sub-wallet to the main wallet of the exchange

$BNB WAS PROBABLY A SCAM VICTIM
Hello friends, today when I made a transaction through the Fox wallet, I had a very uncomfortable situation. I made a transaction of some BNB through PIX, but when the deposit was confirmed, the amount was transferred to another address instantly.