Valid point. At the moment, it’s Web of Trust via @Zapstore. The listing does read “source code not available”. 🧐 I saw an app named Obtainium that claims to let you “get Android app updates straight from the source“.

They both pull code from Git sources. Obtainium will say "Could not find a suitable release." This means the project has not pushed the build even if all the code is readable on Git.