People have been getting temp banned for suspicious activity, it seems to be getting triggered by spam-quickselling (thats what got me :( ). The only thing it prevents you from doing is quickselling stuff (likely for 48 hours).... so not much, but it means once you get hit by it your mystery pack spree is done. I was able to turn 100k training into 3m training (rough math, can't quicksell it right now :( ) and 3m coins so I'll definitely take it.
To those still ripping, I'd advise you to hold your coins, this thing is printing training it seems, but NOT coins, coins are king, and will be doubly so once this debacle is over.