Banks have security against this sort of thing. They manage it by making actually keeping that money after obtaining it without getting caught really hard. I have no idea how it can be protected against when it's bitcoin.

Fiat currency has government buy-in, and government support for loss prevention. Bitcoin not so much. The general anti-government attitude that goes with BTC means there's little incentive for law enforcement to care. (Yes, a server break-in is cybercrime, but so is someone hacking your Wordpress or Facebook accounts, and that's the level of attention it will be paid)