deleted by creator

Very young humans do not understand the concept of object permanence. They actually think you’re gone, when they can’t see you. That is also why you can sometimes see little children closing their eyes, when they are playing hide and seek.

Technically nobody said, that they are gone, just that they are burned

Hard disagree. I do not want to have 2FA for every shittly little thing I do not care about.

QR codes are just an encoding. Just use any half-competent QR code app, and it will give you it’s content, which you can then write down. For the reverse you can use any QR code generator.