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If a user installs the F-Droid build of an app in one profile, they get a key pinning error when they try to install the official build in another profile. Reusing app ids goes against the entire purpose behind having app ids. Each incompatible build needs to their own app id...
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The app id reuse also causes significant usability issues beyond the key pinning errors users encounter across profiles. Users run into similar issues with updates. F-Droid will think it can provide updates to an app installed from elsewhere and vice versa for Play Store, etc.
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Some developers create these issues on their own by not using separate app ids for different variants of their apps, but many are handling this properly and most don't have incompatible variants available. F-Droid is the elephant in the room making this a common real world issue.
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Yeah, app id reuse is their cardinal sin. Even developers who want to provide their f-droid repos (for official builds, beta, etc.) are hurt by it.
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