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They could harvest whatever they want and just not push it to the repo, not limited to metadata.

This would require updating the apps but you can't decompile GP versions to source code...

But you can verify that the source they publish on Github is the same that was used to built the Google Play version with reproducible builds[1]. Also, Android apps are fairly easy to decompile. They are very likely to get caught if they publish an update with a backdoor.

[1] https://github.com/signalapp/Signal-Android/tree/master/repr...

Wow. That's awesome, I could have sworn they opposed to reproducible builds for some reason.

Probably because of this: https://forum.f-droid.org/t/signal-wickr-on-f-droid-2021/122....

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