Things of Internet: Don't open this newsletter! {bait}
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Well, not before solving a crossword, in any case. Came across this campaign today, which is one of those "don't buy" bait and switches, while also doing something, erm, interesting with a QR code.
It's a pretty neat idea. Perhaps the crossword inserted inside a QR code was a bit of an overkill, but sure. Lots of crypto bulls might be cruciverbalists.