Re: Just curious
It's (also) the size of the tracking network.
All the other ones require a specific app to be installed on other people's phones. If you're the only one using (eg) Tile, it's only trackable when it's near your phone - not when out and about.
The Apple Find My tracking is part of iOS, and strongly encouraged to be enabled.
So there are far more Apple tracking nodes out there than any other system. Which also make the Apple one work better for the intended benign use, of course.