Lufthansa has forbidden trackers like Apple AirTags in checked baggage. Apple [said] "its trackers comply with all regulations. It does not appear that any other airlines are requiring passengers to turn off the trackers…"
https://www.nytimes.com/2022/10/11/travel/lufthansa-apple-airtags-luggage.html
"…the real problem, for airlines: passengers publicly exposing the stock deceptions and delaying tactics used on the ground by staff, and gathering hard data on baggage handling failures."