Concerns me on who writes these apps ...
I read that Apple is being very strict on what apps get the new app entitlement. You can assume the official CDC app and probably Apple's App will be the one's using it in the US.
"Apple Inc. and Google said their upcoming contact-tracing tool will be restricted to one public health app per country to get as many people in each nation using the software as possible."
Source: https://www.bloomberg.com/news/arti...-19-tool-to-be-limited-to-one-app-per-country