Am I the only one who has far more sensitive content visible on the screen and filesystem of my computer than through its camera? I feel like, at least for the threat models that I consider likely, if someone manages to hack my laptop and get (for example) microphone access, the thing I am most worried about is that they will use acoustic analysis of keystrokes to recover my banking password, not that they will hear…
I mean, yeah, being hacked (and thereby compromising your screen/HDD's contents) is an issue in the first place and keyloggers are only a few lines of code, but I don't think there is anything wrong with controlling the parts that you can control.
You can't make a physical "no keyloggers for this piece of text, please" switch, but at least they can't hear you talk to a close friend or watch you walk by as you get into the shower (though the latter is a bigger risk for women than for the more common HN visitor, I guess). You're not the first comment I see wondering why we even want this, and it's really weird to see. Why would we not want this?! I don't think that, just because we have webcam stickers, we suddenly stop caring about malware altogether. I think even (metaphorically) my mom understands that if you tape your webcam, a virus can still steal the bank login that is happening on her computer. Even if she doesn't really get the concept of a process, malware, and a web browser in the first place, taping a cam does not make everything on a computer virus-proof.