Because it's free and there is nothing to do. I just create a repo that is my blog, it kills 2 birds with one stone: I keep the content under source control an

Because it's free and there is nothing to do. I just create a repo that is my blog, it kills 2 birds with one stone: I keep the content under source control and it is made available as a website. If I had another webspace I would have to keep my git repo, and in addition I would have to push the generated content to my host. Effectively, when I commit to my repo it's doing the publish automatically.