https://docs.microsoft.com/en-us/azure/storage/common/storag...
In terms of use case: my company has a customer that requires us to locate an instance of our product in Azure, and some of that infrastructure is much easier to move with a compatibility layer.
You might as well ask why there are any standards in software and networking at all, as each new protocol or library isn't THAT difficult to support.
docker run -d --publish 80:80 --env S3PROXY_AUTHORIZATION=none andrewgaul/s3proxy
docker stats