You not only need to trust the German government but any intermediate all the way to the store. I doubt that Apple or Google build the app from the repo. To ad

You not only need to trust the German government but any intermediate all the way to the store. I doubt that Apple or Google build the app from the repo. To add, there are currently discussions underway in the German parliament to give our secret services (namely the notorious Verfassungsschutz) the power to compromise IT systems (Bundestrojaner). I'd trust even the government not that much these times.