Doesn't everyone QA their QR codes? I thought it would be as obvious as making sure you got the right address and/or phone number on an ad before distributing it.
Maybe they do. Do QR code decoder authors QA their decoders to be sure they are getting high accuracy of the raw data? You could make a poor decoder that relies on the error budget to work, while someone checked with a high-quality decoder. Tech with error correction invites corner-cutting. Hard drives, flash storage, even DDR5 RAM does this. Use crapper representation or reading devices and just add more error correction.
You'd think. My local authority is reorganising refuse collection and did a mailshot to let everyone know the new collection rota. Then they did another because the dates on the first one were wrong. The incompetence is staggering.