If you read their terms of service, you’ll find that you are not allowed to place airtags in your luggage (lithium ion batteries are forbidden). In fact, the list of things that are prohibited is quite long.
No liquids, gels, electronics, medicines, aerosols, medical devices (apparently a face mask is a medical device), batteries etc.
So, you can’t put things like toothpaste, shampoo, hairspray, shaving cream, perfume, liquid makeup, hand sanitizer etc in your luggage.
Given that these liquids and gels are also strictly limited in carry on luggage, how are you supposed to take them with you.
We ended up having to check a bag with the airline containing these restricted items which kind of makes the idea of luggage forward less appealing.
Also, it ain’r cheap.
YMMV