Amazon allows you to run code on their servers with strict usage-based billing. Usage-based bill for a git server is essentially zero. Also works for irc bouncers and other such services with low computational cost that you want to run somewhere on the cloud.
Not sure that is right. There is not remote code executing to support it. jgit has a feature where you can push and fetch from an s3 bucket as if it were just an http repo. The assumption is that the s3 storage space and bandwidth would be low enough to be negligible.
