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.
Alexander Schmidt commented
V3.2.8 is on F-Droid
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