This is getting pretty serious in the UK with hundreds of cars going missing. There is even a CCTV video of a 1M being stolen with this method and the alarm not going off, as the OBD port is out of the range of the ultrasonic sensors.
I'm disabling the OBD port on my e92 M3 tonight. If I need it, I'll happily re-enable it, but I will not leave it for scum to take my car without any resistance.
2017 F87 M2, MG, M-DCT
2002 E36/7 Z3 2.2 Sport 5MT
2016 F22 M235i Coupe, MW, ZF8