I like how they just use Github as the database for the assignments. I've seen other instances before, but here I noticed it in particular. My first instinct w

I like how they just use Github as the database for the assignments. I've seen other instances before, but here I noticed it in particular. My first instinct would probably have been to have a traditional SQL database of sorts. That database needs to run somewhere. If I don't want to manage the database manually, I further need a whole web interface running somewhere. Account management. Provisions for users to recover their password if they lose it. And so on. If you just use GitHub, it's up to the users to create a GitHub account and just send you a pull request. If you like what you see, you merge it. Virtually no effort needed. And the database in form of the repository has complete history and is easily replicated or moved, by design. It even makes it easy for someone else to pull the database into their own projects, should they feel a need.