[DeathArrow]

Facebook, Apple and Google use people faces to track them. Governments use public cameras to track people. Google and Facebook also use other kind of tracking people.

But somehow it's immoral for average Joe to track not people but browsers.

[olliej]

Um, as far as I know apple does not use faces to track people.

I'm not sure about google, but my experience with the folk working their make me suspect that even they would not start correlating faces across accounts/users (though I suspect they aren't as careful as apple to avoid that information being visible to them).

But more to the point you're saying "if entity X tracks people it's immoral for anyone else to not track people" rather than "it's immoral for entity X to track people", which is some kind of gross mental gymnastics, and applies to pretty much anything: "if person X gets away with assault, then I should also get away with assault", etc