What's easier to prevent?

a) leaking some long numbers

b) some tech support dude who just wants the boring work day to end so he can go play video games who doesn't know anything about you accidentally letting an imposter act on your behalf because the corporation uses subjective (and undocumented / secret) methods to verify their client's identity

> Are you sure you understand bitcoin well? If not, why not get out now?

This is precisely the reason I can't wait to get out of banks and health care. Bitcoin is a cakewalk.