A buyer who already sees your mobile number displayed as your bank account don’t need to ask you for it anymore and many of them already jump into your dm without any permission sending you messages even though that they can just chat with you there on the exchange that is an attack on someone private space.
That’s not all you could be in more danger having your mobile number on an exchange
Some vendors are doing that by jumping into your DMs chatting you, sometimes when you take time to release their coins for them which is not proper, but must sellers do think that since the vendor has specified that no phone number no payment, they now thinks it’s compulsory to provide phone number before the vendor will pay which is not right.
On using mobile numbers as account number in case of OPay, PalmPay, and so on, I don’t see any serious problem with that since on most centralized exchanges, we undergo KYC which means we have already submitted some vital information about ourselves be it BVN or NIN before we can access the p2p; and we know that our phone numbers can’t be use alone to scam most of us here since we have some knowledge about all these scams.m; you can’t expect me to give out OTP to a strangers the only thing they might succeed in doing is sending some phishing links or so.
Nevertheless, normal bank account number might be safe, even though it will reveal your details once typed in, but for the meantime it will be safer than just our phone numbers. Or the use of the alternative account numbers been specified by some of our colleagues here since OPay, PalmPay, and other categories of wallets are faster in transactions than our commercial banks.