"Ditch the QR code" -- cannot agree enough. The two sources of unsolicited email that Gmail doesn't eliminate (at least for me) are political actors and people

"Ditch the QR code" -- cannot agree enough. The two sources of unsolicited email that Gmail doesn't eliminate (at least for me) are political actors and people who scanned my badge at a conference. So far conferences haven't refused me entry for putting a QR code sticker over their QR code which contains an alternative email address but I wish I had the opportunity to give the conference organizers one email address and a second one for embedding on the badge. Or, as the article suggests, just let me supply an email address when vendors and sponsors ask.