Security cameras (like Google Nest) are not the concern people have: hidden cameras are. It is possible to rig an entire property without any chance of guests finding the cameras. The scale at which it happens is a question (and varies based on country) but the illegality isn't the issue. The dissemination of videos and photos secretly recorded of guests and their children is the issue. There are people in prison for doing this but the damage is done, videos and photos of their guests are online forever.
and my point is that there is no reason to think this is enough of a problem that any well-adjusted person should factor it into the "should I use Airbnb?" calculation. If someone thinks that is an issue then I would assume they never use public bathrooms.
