The lesson here is not "oh look the author is stupid because they installed a shitty QR scanner app and didn't notice the obvious mistake".
The lesson should be; even very experienced technical people fall onto the malware trap. We all have day-to-day problems, unexpected stuff happening, in short life doing its thing. We'll inevitably end up being victims of a scam that happens just the worst possible day of them all, because reasons.
Thus the problem is not if we'll also fall on the trap, but what tools we'll have at our disposal when we do, and to what extent the Operating System will be there helping to protect us (and/or help us diagnose the issue...)
The lesson should be; even very experienced technical people fall onto the malware trap. We all have day-to-day problems, unexpected stuff happening, in short life doing its thing. We'll inevitably end up being victims of a scam that happens just the worst possible day of them all, because reasons.
Thus the problem is not if we'll also fall on the trap, but what tools we'll have at our disposal when we do, and to what extent the Operating System will be there helping to protect us (and/or help us diagnose the issue...)