It&#x27;s probably worth distinguishing between QR Codes used for advertising, vs other uses.<p>For example, I print QR codes on the back of my business cards containing a VCard record, to make it easier to import them into an address book if needed. Or at home, I have a QR code that automatically populates credentials for my WiFi network when guests come over. It&#x27;s also the easiest way to add a TOTP code to Authy or Google Authenticator.<p>I like to think these are reasonable uses.