I would be much more interested if they fully open sourced an S3-compatible git backend that anybody could use with any S3-compatible service.
Does such a thing exist? Hmmm...
Yup, https://github.com/awslabs/git-remote-s3 (disclaimer: never used it)
Yup, https://github.com/awslabs/git-remote-s3 (disclaimer: never used it)