Why private git server on DO

Reading this article about setting up a private git server on DO https://www.digitalocean.com/community/articles/how-to-set-up-a-private-git-server-on-a-vps, I’m wondering why one would do it. The article says,

“This can be a great option if you want to keep your code private while you work. While open-souce tends to be the status quo, there are some times when you don’t want to have your code freely available.”

However, github has private repos (which ou’d have to pay for). However, since you pay for the DO server, is there an advantage I’m not aware of ?