It's possible to build your own tracker atop the Find My network without these anti-stalking features. The Find My network can even be abused for low bandwidth data transfer from any point in the world with an occasionally nearby iPhone.
Are you sure? It seems to me that the anti stalking features depend on the stalkee's / tief's software stack, not the stalker's stack.
Your phone can also refuse to send notifications about the location of a nearby tracker if it thinks it's being tracked, but if there are a bunch of other phones nearby that can relay that information there is nothing to stop them from doing so.
But the target's phone will still be notified that "Someone else's tracker is moving with you", won't it?
> All you need is a Mac and [...]
IIRC, they need you running macos to get the data via a plugin for apple mail. If you only needed an appleID, it could likely be done in a web browser.
Sounds like you responsibility - your belongings, you should know where they are or if they are missing.
How would you have survived before AirTags?
But even with an unmodified tracker, it's quite hard to locate one in a car, because there is a lot of hiding spaces (especially if you put one in some hard-to-reach space such as under the carpet in the cabin etc...).
Using randomized or rolling addresses avoids detection to an extent, depending on how many randomized addresses one uses and how often they're rotated.
However, it's also trivial to detect randomized (or rolling) addresses due to the address being utilized for more than a single locality. Although, I'm not sure that either Apple or Google is actually doing the randomized detection even with this new patch.