Automated Google Dork scanning tools, such as Fast-Google-Dorks-Scan, can "leverage a pre-compiled list of Google Dorks to quickly discover specific sensitive information related to a target domain". These tools automate what would otherwise be a manual, tedious process of testing thousands of search operators across a domain.
Attackers use automated tools to scan for such directory listings to find low-hanging fruit. How to Secure Database Backups: index of databasesqlzip1