To ease on the fear mongering front here: This proposal relies on an app implementing these protocols, you're free to uninstall the app after the pandemic - or not install it in the first place. It is furthermore trivial to check if your device sends out these BTLE packets.
It's not a "can we put the genie back in the bottle" scenario if the genie is wearing a bright warning vest announcing its presence everywhere. You can directly measure if it's still there. All other concerns are not technical ones. If you acknowledge digital contact tracing to be a thing, this is better for privacy than any other proposal so far. The framework is designed to prevent abuse even in case it would not go away.
It's not a "can we put the genie back in the bottle" scenario if the genie is wearing a bright warning vest announcing its presence everywhere. You can directly measure if it's still there. All other concerns are not technical ones. If you acknowledge digital contact tracing to be a thing, this is better for privacy than any other proposal so far. The framework is designed to prevent abuse even in case it would not go away.