Because you can get your own domain in front of it and export your content (i.e. Markdown). Users would land on your domain name, but it doesn't really matter i

Because you can get your own domain in front of it and export your content (i.e. Markdown). Users would land on your domain name, but it doesn't really matter if it's hosted on your PC or GitHub. The point is that you would be able to change providers very easily without having to make people migrate to your new platform.