“In another recent incident, security researchers named Noam Rotem and Ran Locar from vpnMentor have reported on an unsecured AWS S3 bucket containing over 5.5 million files and worth 343GB of data which was found on December 20, 2019, but they could disclose it now only due to responsible disclosure practices.”

https://www.hackread.com/cyber-security-firm-businesses-data-leaked-online/