[arter4]

I admit I don't have kids, but AFAIK kids can do all kind of stuff, like putting crayons in the dishwasher or accidentally breaking things. You usually don't have sensors for all kinds of scenario (what if my kid breaks a glass? what if she starts drawing on the wall?). You either don't care and fix the thing later on, or you try to prevent that from happening, or a combination of the two. Sensors and notifications are not a reasonable solution to everything.

[BoxFour]

If you made, say, a dishwasher that notified you when something meltable was put into it you would probably find quite a few buyers.

Your examples aren’t really great for that reason.