Earlier quoted context omitted.
There are a number of mechanisms besides the FDIC that are commonly used for depositors of this scale. You can even buy your own insurance, if nothing else.
From whom? A search for "bank failure private insurance" kept talking about FDIC and sometimes SIPC.
This is a rather specialized and technical area of finance, and like most technical areas, I imagine it's hard to search for unless you know the magic terms and jargon to search for.