Earlier quoted context omitted.
They are also very bad for tracking compared to what you can get on Aliexpress/eBay/Amazon (which are the same tbh). For about the same price you can get a device with a SIM card and GPS/GLONASS and _zero_ ways to detect it.
What's the battery life on that though? The appeal of AirTags is that they last a year and work anywhere that has an iPhone nearby.
And if you're stalking someone for a year, you'll have ample options to swap the device to a new one with a fresh battery.