The Apple/Google plan just exposes an API to on-device data. There still needs to be an app that retrieves that data and uploads it somewhere (supposed to be implemented by the governments / health officials).

In that way it's similar like e.g. location APIs work - the device handles the resolution and data processing for you, but there still needs to be an app to retrieve it and do something with it.

Hence your original question isn't applicable in context of APIs they've designed.