Is the App on F-Droid (https://f-droid.org)? If not, I think this would help to get more users to contribute to the database as this is an app market, following the same ideals as you.
There is a beta in F-droid, but I don't know if is a official version
Could someone familiar with F-Droid package / add the app there?
The app code is on github: https://github.com/openfoodfacts/openfoodfacts-android