Ok, thanks, I will close this. If you think there’s something wrong or not compliant on the DAVdroid side, please comment here again.
Account vanishing/missing after device restart
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On some Android 4.1 devices or on some Samsung Galaxy S4 – if you install DAVdroid, set up an account and restart your device afterwards the account will be missing.
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This behaviour is an Android specific bug and does not rely on the app side. Android is deleting DRM secured apps (paid through Google Play) after a restart on these versions / devices because it checks accounts and apps in wrong order.
Important notice: This is NOT happening on apps that you got via F-Droid.
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Fixed by releasing https://play.google.com/store/apps/details?id=at.bitfire.davdroid.jbworkaround (see there)