I mean, the bug and the feature of an Apple Airtag is the ubiquity of their devices and their ability to backchannel BLE over cellular networks using millions of end user devices with their pseudoconsent.
Just by the nature of how that expansive network functions, there is no similar alternative that you can control the privacy of.
The alternative would be a GPS transponder intended for vehicles, such as LoJack, or something similar. They are going to have power and subscription requirements, usually cost $1000 for the hardware etc. And in that scenario you still have to “trust” the vendor to a degree.







I have some aging hardware (approaching 10 year old desktop PC) and I switched to Linux. I have to still use Windows at work but none of my personal computers are Windows anymore.
Microsoft can go kick rocks.