Alternate interpretation: Any multi-user support will be wielded by abusers, and no other use cases deserve precedence over inhibiting abuse, so all multi-user cases result in unpredictable sound and/or push notifications to inhibit abuse.
I expect Apple will eventually add “This AirTag has been traveling with you for a while, are you okay with that?” random pop-up notifications, the same way that it randomly confirms “Always Allow” location access and “Time-sensitive” notifications access.
I explain the little chirping sound the one in my glovebox sometimes makes when I start my car to anyone riding with me who doesn’t recognize it, so that they understand what that sound is and to pay attention and be conscious of what it means whenever they hear it.
If occasional chirps are the price I have to pay to inhibit abuse by a global tracking network, then that’s a small annoyance paid for a great good for others.