The comment is a general one. Also it is not a criticism, it was a question because lot of govt are making their tracing app open source.

However, since this is a tracing app and being open source would imply "look, our app is clean, check our code if you do not trust us". Off-course making it open source has other benefits too.

> How do you know you can trust instagram/google maps/ any other common app on your phone?

I don't. If I am using it I know that I have no way to validate or enforce what happens with my data.