I have a Reolink doorbell cam. I bought the POE version, have it connected to Frigate on my server for object detection purposes and triggering alerts, and the alerts are delivered via Home Assistant notifications.
So I guess it's possible to do it reasonably privately, even if using the Reolink app isn't.
If 2 suddenly drops slightly to the side, 1 will begin to plummet almost immediately and not many people have trained for that at the range.