Palo Alto Networks Exam PCCSE Topic 1 Question 6 Discussion

A S3 bucket within AWS has generated an alert by violating the Prisma Cloud Default policy "AWS S3 buckets are accessible to public" The policy definition follows:

config where cloud type = 'aws' AND api name='aws-s3api-get-bucket-acr AND json.rule="((((acl grants{?(@ grantee='AllUsers')] size > 0) or policyStatusisPubiic is true) and publicAccessBlockConfiguration does not exist) or ((ad.grantsp(@ grantee=='AII Users')] size > 0) and publicAccessBlockConfiguration ignorePubhcAds is false) or (policyStatus isPublic is true and publicAccessBlockConfiguration.restrictPublicBuckets is false)) and websiteConfiguration does not exist" Why did this alert get generated?