Thank you for posting this.
I have placed an AirTag in each of my vehicles to serve as a low-cost LoJack system.
as the YouTube video points out, if you have an Apple iPhone it will notify you of the presence of an AirTag that is not registered/linked to your personal phone.
I placed an AirTag in my backpack while in Monterey this year, knowing if I walked off without it or it walked off without me, it’s location could be found very easily with my iPhone.
Larry