Perhaps it's just me, but a set of visual identifiers (letters, numbers) with a certain regulated size seems a lot more viable (and easy to tell if someone is in violation). They've done it with aircraft for decades.
It's harder for the an airspace violator to disable a radio ID beacon on his drone than to just run a Sharpie over a printed identifier.
You'll never stop the hardcore jerks. But you can dissuade the casual jerk from misbehaving. The same way locking your car won't stop a real car thief, but will keep rando handle jigglers from rummaging through your ride.
We're currently required by the FAA to have the license number visible on the drone, but due to the nature of non-winged drones, there's not really any useful large flat surface. If you managed to place a large enough label on the drone to be readable from ~20 feet away then you're going to be running into a lot of issues with aerodynamics and durability in a crash.
Tl;DR - Good luck reading any reasonable label on a 5in drone @30mph 50 feet in the air.
https://www.federalregister.gov/documents/2019/02/13/2019-00...