The perils of fractional reserve banking can arise in any centralized custodial arrangement. As long as no one performs a physical audit—or there is no physical object to be audited in the first place—then accounting fraud can and will happen. This is, in my opinion, the raison d’etre of blockchain. Public, immutable ledgers are immune to this kind of fraud (although they have other issues, of course).
Well fractional reserve banking is accounting fraud. Widespread and legal, but fraud nevertheless. Also fractional reserve banking is a thing of the past. We've now evolved to no reserve banking . The banks' ability to create money from thin air is almost unrestrained.
Let’s stick to fact.