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Interesting although it seem as though Singapore's "TraceTogether" app was able to work successfully without any of these APIs no?

Tangentially related - Singapore plans to open source their app. There's a few details about how it works here:

https://www.theregister.co.uk/2020/03/26/singapore_tracetoge...

Also interesting to read some of the reviews of the app here:

https://play.google.com/store/apps/details?id=sg.gov.tech.bl...

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They've released their open-source version of the app, OpenTrace

https://github.com/opentrace-community/

Interesting in the Android version they request ACCESS_FINE_LOCATION (i.e., access to GPS) instead of ACCESS_COURSE_LOCATION (i.e., access to BLE). They have also include Firebase analytics (which captures city-level location data) into the app as well.

Wouldn't bluetooth be preferable to GPS since GPS requires a direct line of sight? And Singapore being an urban area with underground mass transit and lots of shopping malls I would have though that bluetooth would provide better accuracy of contact/proximity.

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