There have now been at least a handful of post indicating their account has been deactivated due to suspected fraud.

Of course what is interesting is that - the detail on these cases are very light - but seems to revolve around after a transfer from AMEX MR to Aeroplan - and - booking for family members not currently in AP program and not in pool. In one instance, it is clear that the sender is not the same as the recipient (I did not even bother to post the link on that one). There is also a case about cancelling Flex reward last minute (I forgot the link to that one)

Case 1: Reddit Link - 1 million AP account deactivated
Case 2: Reddit Link - AP Account Frozen
Case 3: FlyerTalk Link - AP Frozen after booking for family members
Case 4: Reddit : Require proof of residency status


Of course, just reviewing these cases posted online (with lack of details), one can't really draw a definitive conclusion. I feel that once you are suspected of violating T&C, then you are really in purgatory with compliance with little or no recourse.

With that being said, I think as AP user, we should be more cautious to exhibit some of these behaviors like booking flights for non family member (Especially multiple passengers, last minute), transferring AMEX MR from account whose name do not match, etc. What I am trying to say is that, despite honest effort, lets try not to get flagged by the algos!