I wonder if you can sell the printer shell without the main PCB and just open source the main board design. Manufacture and sale of that board as a distinct entity seems tough to stop. Especially because the board can have non-3D printer use cases which it advertises as the main ones.
My bank and local government aren't making game consoles one of my primary methods of accessing their services. Smartphones are heavily integrated into the daily lives of most people now. They need to be regulated that way and the makers of these devices need to have less control over their users. We wouldn't allow a car maker to charge a fee to parking garages because the driver is "their customer". I need a car, I need a phone; being a hub of value shouldn't allow for such a high degree of rent seeking.
If airlines adopt this more generally maybe Apple will create a feature to turn off air tags for a length of time. Ie: don't transmit for the next 6 hours but then start again. That would make this ban look quite ridiculous.
I will never get over the fact that the Nintendo Switch operated on random character strings to find friends rather than usernames or something more straightforward for normal users. But the fact that they managed it does mean it's not so large a barrier.