Who is the USD Cash Yield portfolio good for?

Everyone. Since US Treasuries are low-risk and liquid, it’s a great way to grow your cash. 

Managing your cash should be part of any financial plan, no matter your net worth and risk tolerance. A low-risk, rate-earning cash management portfolio protects your money from losing too much of its value to inflation. It also protects your money from any sudden market dips just as you might need to withdraw it.