I don't really agree with the premise here. Gitlab is getting lots of new users because of the Github/MS deal but if those users cared about how open-source the

I don't really agree with the premise here. Gitlab is getting lots of new users because of the Github/MS deal but if those users cared about how open-source their git host was, they would not have been using Github. And the value that Github and Gitlab.com provide have nothing to do with their source code availability. They both provide a relatively trustworthy community resource on which to share your code without having to run your own public server. Yes, Gitlab has generated goodwill by having an open-source version of their product, and lots of people have tried it out for self-hosted needs. And so they are the natural first place people will flock to. But the main reason people are moving to Gitlab.com is because it provides an easy and open place to host source code that remains (for now) independent from the tech oligopolists.