Now, you could of course argue that they only have themselves to blame.

I'd prefer all this stuff came with physical switches so it can be enabled/disabled in a hack-proof manner.

While not as precise, you can definitively leak your location by scanning for the surrounding cell towers, especially in a city, which usually have hundreds or thousands of them (Manhattan alone has eleven, for example). I used to run a Python script on my Nokia phone that logged the tower ID, and I could reliable tell when I got to work, home, etc.

And that's just for people who control your phone. Your operator has U-TDOA¹, which is typically accurate to 50m.

The camera part is true, but tape is cheap :)

¹ https://en.wikipedia.org/wiki/U-TDOA

It's also not accurate to within enough resolution start targeting advertising and other nuisance information at me even if there was a way to present me that (which there isn't).

I'm well aware of the power of triangulation, I used to go fox hunting.

http://www.homingin.com/

Though European laws are still mostly sane in that regard.

That's really quite a way from "hundreds or thousands".

What's your threat model? https://ssd.eff.org/en/module/introduction-threat-modeling

For most people mass surveillance is a more realistic threat than the NSA hacking their camera.

I don't have any illusions about being able to stay private from the eyes of nation state level adversaries but commercial entities can still be kept out if you try.