Australia has proposed a bill that would prohibit many of the abuses that could make its contact-tracing app a direct threat.

This is a big step in the right direction. I think more is needed.

Also, even very firm prohibition on abuse of the data will not convince me to install a nonfree program, or to carry a portable phone.

India has published a tracking app, and seems to be planning to require many people to carry it. It may even impose house arrest on anyone that does not carry it.