they only linhk the drone to you if you crash it or lose it i assume they will be sending out stickers or you will have to put your reg number on your multirotors.... So that will be another fail point in the system
True, although most owners won't lose or crash their drones (I have a mavic and its quite hard to lose), nonetheless combined with the ability to take down a drone, I suppose it gives the capability to track an owner.
It does depend on the widespread capability to take down drones.
It does at the moment seem to be a somewhat ineffective measure, given that, I suspect, events such as that occurred at Gatwick have presumably driven it. I don't particulary have a problem registering my drone and will do so, but I think this is probably only the beginning and far more onerous restrictions are just round the corner, this being the first step.