Badges printed by the Eventhosts group support lead scanners by placing a QR code in the upper right corner of the conference badge. If someone at the conference scans your badge with a QR code scanner or photographs your badge with a high-resolution camera, they will be able to capture your email address.
If you prefer to omit this QR code from your badge, edit your profile and update the field "Omit qr on badge". You may edit your profile using the profile dropdown in the sidebar on the left side of the conference home page.
https://neurips.cc/EditProfile
https://virtual.aistats.org/EditProfile