I know one person that had a couple of accounts blocked, which were under different names.
Interesting to note that all his bookings were made via aeroplan.com, and none over the phone.
I believe* with bookings over the internet they store the data differently then ones done over the phone, and because of that it might be easier to run queries on online bookings with the results of above.
* I have bases for that, but eyn kaan mokoym leha'arich.