Not someone who has that kind of money, but people who have enough money to want it perpetually invested and growing (so they can periodically withdraw from it without impacting the base fund), throw it into an index or money market fund like those provided by the big 3 (Vanguard, Blackrock, State Street).
Although you will still need a bank regardless in your life for things like checking and credit cards.
Bronzebeard@lemmy.zip 2 days ago
They’re not keeping a million sitting around in cash. Investment accounts have a separate insurance program