Apple integrates it into their network of phones, such that they can reliably track someone everywhere they go. I don't think other market players are capable of that.

Tile has "Tile Network" which is similar: https://www.thetileapp.com/en-us/blog/what-is-tile-network-c...

That blog is from 2020, prior to the release (maybe not the announcement, though) of AirTags. It's also probably nowhere near as widespread as Apple's device network, but it does exist.

Amazon’s Sidewalk network is backing Tile. All those Echoes, by default, are hardware trackers, too.

Which is why Tile is much better in dense areas than it used to be.