That is absurd. If Gitlab and Microsoft were equivalent, Windows 10 Home would be completely open-source under GPL. Advanced features like connecting to the domain, full disk encryption, and Hyper-V hosting would be "Enterprise".
Conversely, for Gitlab to be as closed as Microsoft, their entire product would be closed, except for the source code they use to color labels in issues, or perhaps they'd hand out the spec to their flavor of Markdown.