It’s not just suspicious links you need to watch out for in your email inbox: QR code phishing – or “quishing" – is becoming an increasingly common threat, with fraudulent codes designed to slip through security systems and fool you into surrendering your financial information.

https://www.techradar.com/computing/cybercrime/quishing-is-the-qr-code-scam-you-need-to-watch-out-for

@TwistedWhim As a retired 45-year IT professional, I am begging people, PLEASE do not use QR codes. They can be subverted to do truly evil things to your PC, laptop or mobile device. Never trust something that doesn't show you clearly in advance what it's going to do.