Most services that convert a link to a QR code absolutely track their users. bit.ly (the URL shortening company) has a paid service to track where, when, and device IDs of who accessed the link whether it was through their shortened URL or the conveniently generated QR code that they can also make you.
Most services that convert a link to a QR code absolutely track their users. bit.ly (the URL shortening company) has a paid service to track where, when, and device IDs of who accessed the link whether it was through their shortened URL or the conveniently generated QR code that they can also make you.