https://www.cnbc.com/2018/11/30/marriott-hack-raises-questions-about-merger-diligence-tools-in-use.html

The Marriott breach has the sheer numbers and brand star power to make people take notice: 500 million people were affected, including possibly anyone who stayed at ubiquitous Marriott and Starwood properties across the globe. An unknown attacker stole information including emails, names, addresses, passport numbers and possibly payment card information, in a slow-moving attack that lasted four years.

The breach itself isn't terribly unusual except for two critical questions: