https://www.bleepingcomputer.com/news/security/hackers-share-stolen-mgm-resorts-guest-database-with-10m-records/

An archive with over 10 million records of guests at the MGM Resorts hotels is currently distributed for free on a hacking forum.

The data comes from a security breach in July 2019 on one of MGM cloud services. In total, there are 10,683,189 records with about 3.1 million unique email addresses as far back as 2017.