A screenshot of a bluesky post by user "s3.amazonaws.com" saying "Hello it's me your good friend Amazon S3" https://assets.chaos.social/media_attachments/files/110/307/527/459/839/047/original/cf1ae6754c568625.png
It turns out you can simply serve a file from a domain to use it as your bsky handle.So this guy is now S3. All of S3.