They might not be visually intrusive but they are indeed very intrusive. If you went to the mall would you find it intrusive if Macy’s put a little beacon on your shoulder every time you walked in the door so they could follow you around and track your movement for the next few days? The beacon is small and unassuming and tasteful - you’ll hardly even notice it! Who cares? A stalker is a stalker no matter how nicely it blends with the aesthetic.