This is not true in any sense.
It’s not true as a physical description of money creation nor as a description of the underlying technical process.
(1) Physically: the “mint” does not create consumer cash. In the US, the Bureau of Engraving and Printing prints up new bills, not the mint. The mint makes new coins only, but both the mint and the BEP would only produce new money based on central bank instructions. It is the central bank only which dictates whether new base money will be introduced. Only if there is an official request for new coins will the mint produce new coins.
(2) For the technical process of money creation: The central bank orders the creation of new physical currency only in exchange for already-existing computer reserves (monetary base), which only they create. Only if a bank actually has monetary base available, and wants to exchange that base for physical currency, will the bank receive physical currency. But this does not increase the total amount of monetary base. It’s a 1-for-1 exchange of electronic reserve base money for physical currency base money. This does not increase total base money.
This is also entirely untrue.
The Fed accommodates demand for physical cash only if a bank has monetary base with which to exchange physical base. Even supposing that one bank somehow magically monopolized all reserves, they would only be free to replace their already-exiting electronic reserves with physical cash. The Fed would accommodate their “demand” for physical currency only if the bank already had the reserves to exchange for it. But the private bank could not dictate the creation of more base money. They could replace all of their electronic reserves with physical cash, but at that point, the process would be over. The Fed is under no obligation whatsoever to increase base money.
For previously mentioned reasons, it would not be profitable for a bank to monopolize all reserves. It would be far too costly. The bank would go bankrupt. It would cease to exist.
This is also not true.
The FDIC insures private depositors, but only up to 250,000 dollars. Deposits in excess of that amount will lose money, non-depositor lenders to banks will lose money, and the bank owners will be wiped out entirely.
I’m not sure why someone would post a question to a factual forum when they believe they already know the answer, but it’s clear at this point that the OP does not stem from genuine curiosity.
Kind of a shame because the original question was genuinely interesting. It was one I hadn’t seen before. Very rare.