> I've learned it's not that uncommon. Even letting friends track you.

This is actually somewhat old news. Snapchat pioneered this with the Snap Map, where essentially the whole purpose was to broadcast where you are to your friends.

That was so long ago now that even Snapchat is long last its peak relevance.

There was also Google Latitude way before that. I remember how excited my friends were to watch other friends move about the city. It did come in handy one time when a friend left his phone behind at a corner store and didn't realize until later.