Personally, I'm not interested in the [qrcode] tag, as it has some abuse potential.

Humans can't read QRcode and many likely don't have QRcode reading apps that clearly show where the QRcode will lead you to in a privacy friendly way. And even when your QRcode decoder shows you what's encoded, link shorteners will make the situation even worse and there will be enough users who will open such links anyway.

As I rarely see any QRcodes in this forum, this proposal feels like a solution for a non-existing problem.

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The [hide] tag I'd love to see as soon as possible.