I was thinking the same thing, are we going to have a mess of contact tracing apps and services with the similar analogy of the incompatibility with differing m

I was thinking the same thing, are we going to have a mess of contact tracing apps and services with the similar analogy of the incompatibility with differing messaging protocols? > Also, it's much easier to make it mandatory if it's a system app (and obviously it needs to be mandatory to be useful). That might work in the case of Apple, Google Pixel and (some) Android One devices where the firmware is (often) manufacturer controlled. Outside of the Google Play Services approach good luck trying to deploy a new Android feature to all the devices out there.