Thanks a lot! Really appreciate your feedback! In fact this is a private initiative, GitHub is not part of this. I was just tired of synchronizing manually my packages so I decided to store them in a Google Cloud server. And since a couple of people told me they would want a service like this, I made the package available for everyone.
In the future, I plan to add some "premium" features and maybe charge for them so I can pay my server costs, but the basic package synchronization will always be free. Also, the source code for the server will be open sourced this weekend if you want to host it yourself.
The busy indication is a great idea! I will try to implement it in the coming weeks and will surely add GitHub as an alternative authentication provider.