Potentially, but it could be a significant amount of upfront and ongoing work to find banks paying competitive rates today and to track them over time. You would also need to factor in account minimums, transfer restrictions, and account fees, and to identify enough of those banks as needed to make sure your cash is FDIC insured. Then, on an ongoing basis, you would need to continue to monitor the interest rates paid by those banks while manually transferring funds between your accounts as interest rates change or as you reach FDIC insurance limits. Finally, you would have to collect monthly statements and annual tax documents from each bank.
A Flourish Cash account is meant to simplify all of that—open one account in minutes and benefit from a competitive interest rate and greater FDIC insurance than a single bank account. You will have one interest rate to monitor and receive one set of account statements and tax documents.