I guess that Ring Blink and such like has a market, when they work they do work well, the Ring doorbell I had was useless, even on WiFi. One of my engineers has one and says it great, though when Ive been with him when it rains he get millions of notifications. I have a decent CCTV setup at home that notifies me when someone is in my garden, or at my front door. I dont get false activations when it rains or when there is a cat in the garden, so I am more likely to look at my phone when I do get an activation, unlike my engineer that ignores activations from his Ring most of the time