They automatically convert most stablecoins (though very notably not Tether) into BUSD upon depositing. Then if you withdraw some USDP/TUSD/USDC/maybe some othe

They automatically convert most stablecoins (though very notably not Tether) into BUSD upon depositing. Then if you withdraw some USDP/TUSD/USDC/maybe some others I'm not remembering, they'll subtract it from your BUSD balance. FTX did something similar, though they just auto-converted them to and from fiat USD (again, notably, not applying this policy to Tether).