Related, from a few days ago https://news.ycombinator.com/item?id=22514584 https://news.ycombinator.com/item?id=22514584 "Can we stop Covid-19 using Bluetooth?"

Related, from a few days ago https://news.ycombinator.com/item?id=22514584 https://news.ycombinator.com/item?id=22514584 "Can we stop Covid-19 using Bluetooth?" While this seems like a somewhat more sensible idea in terms of privacy, all the same technical restrictions apply.