Just got the following from Optum (which my employer uses for HSA direct deposits). It doesn't seem to suggest the fee structure has changed, so there's still a cost to invest, but it's an improvement.
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Subject: New HSA investment choices now available to help make your savings go further
Dear [Rural],
We are happy to announce that you now have access to an enhanced fund lineup for your health savings account (HSA). The lineup will continue to provide funds with no trading costs, commissions or minimum balances, managed by extremely reputable firms.
To provide further diversification options, your new investment lineup now includes the Charles Schwab Target Date Fund series, and the highly rated Vanguard Index Fund options. They feature below industry average expense ratios and above industry average Morningstar fund ratings.
Investing basics:
Once your HSA reaches the minimum investment threshold, you may choose to invest a portion of your HSA dollars in mutual funds — just like you would with a 401(k). The minimum amount that can be transferred at one time is $100. Therefore, you will need your threshold amount, plus $100 in your HSA before you are eligible to invest. You may choose from a wide variety of mutual funds and any investment earnings such as interest or dividends are income tax-free.
Find the right investment for you
See how the new mutual funds might fit into your investment plan. Log into your account to review your investment options, or contact Optum Bank® Customer Service at 1-877-470-1771 for more information.
Edited to remove randomly-inserted "make the font tiny" code.