I agree that this is concerning. A QR scanning app has access to possibly sensitive information and shouldn't be "calling home" at all.

What is this tracking? I've deleted the app.

The app is really great and functional, but trackers in it are a privacy and security concern. Please remove them.

I use Binary Eye now from F-Droid, it's not as good, but it's close enough.

in the F-Droid version tracking seems to be disabled

gradle:

fDroid {
            buildConfigField "boolean", "ERROR_REPORTS_ENABLED_BY_DEFAULT", "false"
        }

and F-droid yml: https://gitlab.com/fdroid/fdroiddata/-/blob/master/metadata/com.example.barcodescanner.yml

gradle:
      - fDroid
prebuild: sed -i -e '/io.sentry.android.gradle/d' -e '/^sentry {/,/^}/d' build.gradle

Unfortunaly it still sends requests to sentry.io ...

in the F-Droid version tracking seems to be disabled

gradle:

fDroid {
            buildConfigField "boolean", "ERROR_REPORTS_ENABLED_BY_DEFAULT", "false"
        }

and F-droid yml: https://gitlab.com/fdroid/fdroiddata/-/blob/master/metadata/com.example.barcodescanner.yml

gradle:
      - fDroid
prebuild: sed -i -e '/io.sentry.android.gradle/d' -e '/^sentry {/,/^}/d' build.gradle

please create an AndroidManifest.xml variant for F-Droid flavor
and set

 android:value=""

for Sentry to switch it off
See https://gitlab.com/fdroid/fdroiddata/-/issues/2846

Link this fact with the fact that the developer doesn't respond at all to all these reported issues and bugs, and you've got a very suspicious situation...

for F-Droid we fixed it by different means :-)