You can find websites using Google bucket storage using this tool.
The Buckets resource represents a bucket in Cloud Storage. There is a single global namespace shared by all buckets. Buckets contain objects which can be accessed by their own methods. In addition to the acl property, buckets contain bucketAccessControls, for use in fine-grained manipulation of an existing bucket's access controls.
If attackers detect the technology used, they will try to detect vulnerabilities related to this application.
Only use components that do not have known vulnerabilities, only use components that when combined to not introduce a security vulnerability, and ensure that a misconfiguration does not cause any vulnerabilities.