[bbx]

This triggers the question: why is the app not available worldwide in the first place? And why should every country develop their own? Since Apple and Google are already providing an "Exposure Notification system", shouldn't such an app be distributed natively (i.e. not through a geo-blocked app store), like the Phone or Compass apps? I understand this would mean the app should be developed, or at least released, by Apple and Google directly. But since they're already helping out with the notification system, we're halfway there. I also understand there are lots of legal and regulatory implications for having a worldwide app, but I feel like we're past this point already.

Sorry if I'm sounding naive, but people are going to start traveling again, so limiting a tracing app to a country's borders seems arbitrarily inefficient to say the least.

[majewsky]

The hard part isn't building the app, the hard part is integrating with the health administrations in every country. In Germany alone, there are nearly 400 county health administration offices to interface with.

[Mindwipe]

It's not a single app. Apple and Google provided common APIs, but there isn't an Apple/Google "app".

There are lots of different legal requirements, and the app points towards the local testing regime for example which is different in every country.

The Apple and Google roadmap already discusses that future items include more interoperability to enable international travel, it's just not a v1 feature.

[bb123]

I think the problem is that there is no single definition for many things around this app. Each country has a different definition of what constitutes contact for example.