The bare idea is very much similar to S3, i.e. a file store. I hope to bring a different value with things like webhooks, Docker images rebuilt automatically as files are uploaded (e.g. for reconfiguration prior to deployment on a cluster of machines), ... agreed these additional features are vaporware but I get started :)

Now, I really think that re-using scp is neat. For instance if you have tools to manage a cluster of machines, it is entirely possible you are already using SSH deploy keys (i.e. you have tools to manage SSH-based credentials). But sure you are probably also using other services that requires API keys.