I don't know for iOS but on Android they are not excused, just register intent for your url and let the system camera app/qr code scanner pass it. Effectively

I don't know for iOS but on Android they are not excused, just register intent for your url and let the system camera app/qr code scanner pass it. Effectively you can expect it to work for Android 8+ as the previous versions don't necessarily have a QR code scanner.