> I have never heard any normal person ever talk about data privacy.

I hear normal people talk about it all the time. The only place where I hear that only people on HN care about privacy is on HN, constantly.

edit: I suspect that tech people who work on privacy-invading technologies live in a rationalization bubble that tells them that the complaints that they constantly hear are from a vanishingly small nerd contingent that they themselves just happen to immersed in. They don't believe their lying ears.