Me I see this message too and first thing wey come my mind na those crypto traders wey dey do exchange for whatapp or telegram.
It is not their private key, they should know that Binance is an exchange, not a noncustodial wallet which they have full control over as they have the seed phrase or private key of their own. But some people are truly just novice about it. After several notifications from Binance, yet an email message, now see what Binance did:
[Action Required] New deposit address retrieved
Thank you for retrieving your new address under
[AMB, ARBITRUM, AVAXC, BSC, CELO, CHZ, CTXC, ETC, ETH, FTM, GLMR, KLAY, MATIC, MOVR, OPTIMISM, REI, RON, RSK, THETA, TOMO, VET, WAN, WTC, XDAI]
network. Please note that subsequent deposits to your previous address can no longer be credited automatically. If you have deposited coins into this address, you need to trigger "Click to credit" on the deposit history page.
Binance reserves the right to close the "Click to credit" function anytime. We strongly encourage you to update all records of where you have stored your previous address as soon as possible.
If anyone still use the old addresses and no longer receive their deposited coins, they can just do it manually. Or if they contact Binance, they are going to be be told to just do it manually on the deposit history page. I hope time would be given for this.