Previously, it was very safe to AB in the attic, as TNT didn't monitor it. Now that the cat's out of the bag, more and more people will start using EC2. Eventually, TNT will have to do something about it. Therefore, I'd say the chance of being frozen is highly likely, because eventually (probably within the next year), EC2's popularity will increase high enough to catch TNT's attention. Most of the guys who enjoyed this system to the fullest have already left/are leaving the attic for good, with their fair share of profits, so, it's kind of every man for himself deal now.
Just AB on a side account.
+rep for the detailed response.
Right now I'm using EC2 on a side account and I hope I don't get chain iced. If I do I'll probably say fuck it and quit neopets.