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QR codes can't "expire". But if the code is the url for a shady redirect site instead of the site you wrote, that's your fault for not checking what the generator actually put in there. There is usually absolutely no need for a redirect.

I agree with the fact that the QR code was a crappy redirect, and one should verify the result. As the (SW / embedded developer) husband of a very non-technical psychologist I have learned not to be too judgmental of those who do not fully grok (sorry) these technologies.

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