Re: who writes down the MAC address of their device?
In any case, if memory serves me right iThings will use a randomized MAC when scanning, but not when connecting to a known network.
Ding, ding, ding, correct.
I was surprised to have got this far through the comments before finding someone point that out. Sadly, I wasn't surprised that El Reg had got that fact wrong :(
The trial the IEEE ran on randomising MAC addresses did change for more than scanning, though AFAIK that's not gone any further yet.