> Why have security? So some random, untrusted person can't compromise the account. I know why there should be security. I was pointing out that what you sugge

> Why have security? So some random, untrusted person can't compromise the account. I know why there should be security. I was pointing out that what you suggested would degrade security. It's not whether one specific person would do anything with 30 phones' backup codes but that such a list would exist. There are many other valid security practices that can be used.