That's pretty standard for a lot of these new-tech-wave style brokerage psuedo-banks. Betterment, Wealthfront, etc which also have a form of savings accounts (don't believe they offer checking accounts like rh is doing here) are SIPC only as well.
Betterment has their Smart Saver[1], which offers a 2.09% rate and attempts to position it as vastly better than FDIC-insured accounts by comparing to some terrible “national average” instead of the ~2% rates that Ally, Capital One & others offer. It’s still an investment account with the risk, tax implications & liquidity challenges that such an account has.
Their misleading marketing around this is driving me away from them.
[1]: https://www.google.com/amp/s/www.betterment.com/resources/sh...
> Smart Saver’s built-in portfolio is the Betterment Portfolio Strategy’s allocation at 0% stocks, 100% bonds.
The one big downside could be is if you need cash _now_ it can take a few days (5?) before being able to use it.