I had a customer drop off their PC for service and they had the "all-in" setup- everything in Windows signed in, opted in to everything imaginable, including the phone link app.
While I worked on their PC I got copies of every phone notification, as well as the ability to act on those notifications. I saw every SMS his wife sent him. Everything. Just pop-up notifications in my face. Very nearly hit the "activate alarm" button for their home security system multiple times.
If you use this, you are the absolute bottom of the barrel- the dumbest buffoon to have ever existed. If you use Window's "phone link" app, you should be absolutely ashamed of yourself.