I'm not sure if you're trying to say that GitLab could be five-person company, but it's much larger. I don't think they list the number of employees, but say 56 countries so I'd wager at least two or three times that.
I am saying, exactly, that it could be, waiting in github's wings with 5 employees. They were exactly that at some point. They started in 2011, and they went for Y Combinator in 2015. They waited, and waited, and then grew. The $100 mil raise was right after MS bought github.