Comment by The_Colonel

Gitlab, GitHub and SourceHut are remotely comparable only if you care just about source code hosting. But Gitlab (and partially GitHub) is so much more - it grew to a beast trying to do everything for your project - project management, CI, analytics, communication... It's not for everyone, but for e.g. startups buying an all-in-one solution could be attractive to reduce the effort on getting all development tools set up and integrated.