The 2015 OPM hack got every application for a security clearance. Which includes every place you lived for the past 15 years with names and phone numbers of people who knew you there. I expect the FBI data includes similar stuff. And because the FBI deals with financial crimes, I expect the data also includes bank account statements/transactions.
We as a country need to start treating PII as radioactive - that touching it or keeping it anywhere near your computer network is a company-ending disaster about to happen. The legal standard needs to be strict liability like CSAM or DUI.