Banks make loans. Banks are expected to have sufficent cash reserves to service all of their customer accounts. If a bank fails, account holders dont get their money back aside from whats insured by the FDIC and only up to 250k$.

Bitcoins are literally just pieces of a digital ledger system. No loans and all units of account are depedant exclusively on the ledger.

Regulating a bank is required because banks take in capital from account owners and take on additional risk by loaning that capital to others which may or may not get paid back. If banks lose money from bad loans to a point they dont have the cash available to service customer accounts the only thing they can tell people trying to make a withdrawel is 'tough titty'.

You don't have that problem with bitcoin. You get many other problems with it, volatile pricing and a complete inability to control money supply, but that's not one of them.