Maybe we could have laws that protect us from these kind of cameras instead of enforcing them. I'm against saying "No you can't do this" but I'm all for "You must show us how you do this" or "This thing must be optional".
You can already make cameras do this in software, why aren't we buying redactocams now?
If it's already in software, then your phone is just one irreversible update away from getting that feature for free! People love free stuff!