GitLab has stated they want to manage the full software delivery process for ages now. There are other basic code repo managers out there (Gogs, Gitea, ...). GitLab is obviously able to invest a lot more in their product, but part of the reason for that is that they're not just focusing on being basic code repo managers.

For example, GitLab CI/CD is far more useful to me than configurable tab width would ever be. It's not a basic code repo manager feature, but there's a clear reason why they're focusing on one more than the other.