I always thought it was a bad idea for AWS to make the buckets unique globally. Attach the AWS account Id so it would always be unique, you can name a bucket whatever you want, and this attack vector wouldn't be possible (unless if you are AWS I guess)
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Good reminder to remove old DNS records that point to IPs or hostnames you no longer control or service providers you no longer use.
That's the main attack vector here - you delete an S3 bucket but still have a subdomain CNAME'd to it, so anyone could create a new bucket with the same name and serve arbitrary files from your domain.