I think Coinbase has to be careful if they consider mixing the bank deposits with crypto wallets. They could fall into a gray area where consumers can be confused as to the guarantee of the FDIC deposits vs the custodial services for crypto wallet balances. This happened to many institutions during the financial crisis as many money market fund could not maintain the $1 NAV without sacrificing fees and related expenses. There was confusion from some customers that thought that these balances were also guaranteed by the FDIC when they are not.