I think the point here is that on iOS, compiling/running/making it work requires an entitlement (i.e. permission) that is granted only to those who are signator

I think the point here is that on iOS, compiling/running/making it work requires an entitlement (i.e. permission) that is granted only to those who are signatories to Apple's agreement on getting access to the Covid API. See the yellow "important" box on https://developer.apple.com/documentation/exposurenotification https://developer.apple.com/documentation/exposurenotificati... for some more info. Not sure how this works on Android but I assume there is a similar permissions gate to prevent other apps accessing this feature.