I came to share exactly that conclusion for different reasons. Like they remember people and always attack the same ones and leave alone the same ones.
I always wondered... So in theory trackers are harmless. But for a bird? They're freaking huge. Birds fold their legs up tight to sleep. It's a small fraction of their body weight on one side, all the time, for months or years... That can't just be a minor inconvenience
It's got to be like wearing a work boot on one foot and a tennis shoe on the other every day