From the first sentence under the "What are securities" section:
> SIPC protects stocks, bonds, Treasury securities, certificates of deposit, mutual funds, money market mutual funds and certain other investments as "securities."
Well, I'm not going to take responsibility for reconciling the inconsistency here.
People said at the time that Robin Hood was offering a money market fund by another name, using short term investments to produce that 3%. The head of the SIPC took exception to the idea that the accounts would be covered, as I quoted. I can't say where the confusion lies.