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Requires google play services to run with the developers not caring at all

Technically, you are free to implement the Exposure Notification [1] API for your own potentially open-source alternative of Google Play Services, right? Or why would this currently not be possible?

[1] https://en.wikipedia.org/wiki/Exposure_Notification

People are working on that: https://github.com/corona-warn-app/cwa-app-android/issues/75

Edit: and also see https://github.com/theScrabi/CoraLibre-android-sdk/

What fraction of the German mobile phone user base is running Android without Google services? My guess would be <1%

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