This is one of the few issues that is indeed real. I’m not sure if tracking only infected people would be worth the effort and the risk of bad publicity though.

My comment was about the fact that the keys need to released to the general public. This is a decentralized scheme. People won't participate in the first place if it is not secure or controlable. This thing could be run centralized but imagine the cross-government / legislation data sharing. Have fun...

So it’s just a generic ‘technology is scary’ handwave. With the right intonation you can make it sound kind of convincing but it’s still not helping anyone.