It would be silly to have to put a QR code to a web site, but 4" to 6" eink users might like that to view a large colour image on their 8" to 12" tablet.
I've tested QR codes in ebooks on DXG, Kindle Keyboard 3 (mobi) and PW3 (azw3) as well as Kobos with my small phone and 10" tablet. Also works on paper version which is only going to have mono.
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