I have a pixel watch 2 and have had a few false positives - one because it thought I had fallen (for some reason. I don’t know why; I was just lying in bed at the time) and one because I didn’t know you could press the button five times to call emergency services, so I let my kid play with the watch.

In both instances, the watch vibrated violently and constantly for about five seconds before initiating a call. During those five seconds, it displayed a prompt to cancel the upcoming call. I wasn’t quite fast enough to cancel the call my kid started, but I did manage to cancel the one for the alleged fall. For the one that went through, I hung up just as it connected, so they called me back. They did not appear perturbed by the mistaken call, but it only happened once; if it were repeated like you described, they probably would have been more upset.

I agree that we should have false positives as rarely as possible, but I think having the opportunity to cancel a call from one is a good stopgap.