Generic GPS transponder (containing GPS receiver + some kind of data connection) will have limited battery life.

Systems like Tile, AirTag can last much longer with smaller battery and overall dimensions by offloading GPS and long data transmission to other devices. Strength(and dangers) of devices like this is in the size of tracking network not necessarily the hardware itself. Even better if you don't have to plant the tracker onto victim, because victim bought it and is intentionally carrying with themselves.

In that case you have to plant the transponder yourself.

In the case of Tile, everyone using Tile has tagged themselves (unknowingly) for you.

The consumer who didn't know they tagged themselves would understandably have a complaint.

Criminals, particularly heavily disordered ones like stalkers, are usually not the smartest people in the world. So increasing the barrier of entry just a little bit might substantially decrease their practical access to this type of technology.

Suppose the person you want to stalk has bought a Tile that they use for themselves, not knowing that these devices are insecure. If you scan for that device, you can follow that person without even having to plant a device on them. You don't have to hack their Tile.

Because it serves a nefarious purpose: to smear the company that makes these devices. I would not be surprised if this is part of some kind of campaign designed to restrict or damage someone.