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We have found the following implementation choices in COVID-19 Apps.
The overall structure of the App with all its components
Availability of source code and licensing
Is the source code available for review, reuse, or not at all.
Approach to implementing contact tracing
Type of privacy policy for App Users
Type of the App's Cloud Component
How users are identified in the system
Why this matters:
Apps can make different implementation choices when implementing a certain feature. While any of those choices can deliver the desired functionality, some of them may have dramatic consequences for innovation, privacy, potential for abuse or effectiveness. By grouping them here, a comparison of pro’s and con’s can be made.