https://www.bleepingcomputer.com/news/security/cafepress-data-breach-exposes-personal-info-of-23-million-users/

CafePress, a well-known custom T-Shirt and merchandise site, suffered a data breach that exposed the personal information of 23 million of their customers.

Users became aware of the breach today, not through CafePress, but through notifications from Troy Hunt's Have I Been Pwned service.