Earlier quoted context omitted.
I don't get it - that competition is of bike thefts for unguarded and _unlocked_ bikes. Surely it means nothing. Do people not buy bike locks in those regions? Is it typical for a 13mm+ Ulock in Amsterdam to get broken?
U locks don't deter thieves at all. If they want a bike, they will get it no matter what. Almost everyone commutes on beaters for good reason. https://www.citylab.com/navigator/2014/10/your-u-lock-is-bas...
[1] https://www.amazon.com/Kryptonite-Evolution-Mini-Bike-U-Lock...