[madads]

I like the explanation that simply explains "privacy": When you are going to the toilet, and everybody knows that your going and what you'll do there, but you still close the door (for the most of us, most of the time).

[Spivak]

Sure, but people close the door out of modesty not really privacy. If there was a machine that provided a written transcript of what someone did in the bathroom with no video/audio I don’t think people would mind.

Like when you’re in high-security areas and have to be monitored in the bathroom there might be a door between you and your guard but no real privacy.

Or when people loudly object to strip-searches at the airport but the scanner that sees everything but then only shows a cutout highlighting suspicious areas to pat down are mostly fine.

[Doxin]

I think it's a pretty good workable analogy actually. People don't mind if you know they go to the toilet as an abstract thing, but once you start keeping a notebook of who is going to the toilet and when it starts getting creepy and undesirable. And that's just for collecting metadata! imagine if someone would actually intercept your sewer and analysed the makeup of your turds, folks would be up in arms.