Meeting could happen in public, it doesn't mean they know their private address.

For example, meet someone at a convention/fair/job, gift/sell them something which has a hidden tag, and then wait for them to drive to their hotel, or home. Gotcha. With influencer and celebs, you can also send something to their agency, and hope they are re-routed to their home. S** like that happened quite often until people learned to be more careful. Probably still sometimes happens even now.

I'm sure idiots do this but it's a pretty high risk way to try to track someone. IME the tracking notifications are timely enough that you're going to have a good idea where they came from. Actual GPS trackers are cheap on Amazon, have better accuracy, and don't notify people they exist -- they just don't have the public's mindshare nearly as much.