Security had taken a back seat at Yahoo for some time now. It’s no secret that top security brass had very public clashes with upper management, including CEO Marissa Mayer, over the inconvenience or cost associated with bringing the site into the 21st century security-wise. Reports also suggest they may have known about one — or even both — without disclosing the extent of the damage to users or potential buyers. Between the 2012 hack (450 million), 2013 hack (1 billion), and 2014 hack (500 million), you really have to wonder what it would have taken for Yahoo to get the memo. If you think Yahoo’s security team just didn’t notice hacks of this magnitude years-later, you’re probably going to want to go back to the kiddie table while the adults chat for a bit.