> I don't want to live in a world where my parents and grandparents are expected to pull up Wireshark to figure out if the app they're using will record their front camera without consent.

It's a "commons" issue. I don't necessarily trust FOSS software because I am going to login to the repo and check the code (though I have once or twice), I trust it because I know thousands of people motiviated by ethics and quality vs. money have peer reviewed the code for things like this.

Similar in concept to herd immunity.