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Nextcloud cries foul over Google Play Store app rejection
(www.theregister.com)
This is a most excellent place for technology news and articles.
In the Basic version only, last time I checked the "original" F-Droid couldn't do it. And there's also some minimum API level an app has to target to be eligible for automatic updates (found that out through updating microg and having to click "update" still)
I have the regular F-droid and it does automatic updates now.