Earlier quoted context omitted.
What are securities in this context? Is that not something that you personally choose to invest in? Because if it is, then this is basically the same. Your cash is fully insured, but obviously your investments run investment risk. If Robinhood automatically converts your money into securities, then it's a different matter. It sounds unlikely to me that any bank account would work that way, but I don't know how Robinh…
Not an expert in this domain but I'll cover the basics: ecurities are a euphemism for stocks and similar. Banks have been loaning out the money you deposit since the beginning of time; it's how they make money. They don't keep all the cash that people have deposited on hand, which is why a "run on the bank" was problematic in the past. They basically keep enough cash around ("reserves") so that the average withdrawal…
I still suspect that the securities mentioned are your own securities rather than the bank's, which makes it totally sensible that they're not covered by the insurance.