> Making a CryptoBank is like making a regular bank on hard mode.

Back in "the old days" bank security was based around metal vaults and guns. That I would also consider doing banking on hard mode.

Coinbase just needs good specialist engineers and a good insurance policy. Not much different from a traditional bank.

At least Coinbase has an advantage over traditional banks. Good engineers would probably rather work at Coinbase where they get to play with cool Bitcoin tech, rather than a stuffy old banking system which still limits passwords to 8 characters...