By having an applicant's driver's license number, the insurance company has the information it needs to request a copy of the applicant's Motor Vehicle Report or MVR from the state which has issued their driver's license, which informs them about such
infractions as
multiple moving violations.
The reports to European data protection authorities, which were filed simultaneously
by multiple consumer organizations, cite news coverage that Facebook didn't adequately protect its users» data — firstly
by being careless about providing third parties access to it and secondly for not rectifying the breach when the company became aware of it back in 2015 — as a reason to investigate possible
infractions in Europe.