Well, it's stored in an encrypted way - in the encrypted password database. Much like a password, everyone already knows not to share a passkey. But also like a password, as the owner, sometimes I want to look at it!

Genuine question: why?

Genuine answers:

- because I like backing up my data, especially credentials

- because I like looking at how things work in practice - you are on a website called hacker news after all

it's mine.