Incorrect. Every depositor has 1 account per account type per institution insured up to 250k. If you had 100 accounts of the same type at the same institution

Incorrect. Every depositor has 1 account per account type per institution insured up to 250k. If you had 100 accounts of the same type at the same institution, you're still only getting 250k back from the FDIC. To do what you're proposing, you'd have to have 100 accounts at different FDIC insured institutions. The logistics there is vastly different, but meshes quite well with designing for fault tolerance/resilience.