Use a better QR scanner app. I use Privacy Friendly Apps' "Privacy Friendly QR Scanner", which always presents you with the scanned URL or text in the app befor

Use a better QR scanner app. I use Privacy Friendly Apps' "Privacy Friendly QR Scanner", which always presents you with the scanned URL or text in the app before doing anything, and asks you to verify that you want to visit the site. It also includes the ability to generate your own QR codes. See https://secuso.aifb.kit.edu/english/105.php https://secuso.aifb.kit.edu/english/105.php for that and other apps developed by that research group.