Hm, who actually uses GitLab or Atlassian? Who else is getting lots of users en masse at this level that they become dependent on the software, if GH goes down, there goes a ton of open source and indie devs who depend on it. Re: enterprise sales, well that's startup life for you.
Re: hiring & sales - on a semi tangential noet
Honestly, when I visited GH last year and met the very (few) women that worked there (they were all in marketing), (it was the UE4 workshop with like 3 women in attendance, great workshop, but I noticed more and more of the staff at happy hour (their bar) was filled with lots of marketing/sales people -- something I hadn't really experienced other times I visited, usually its more devs than those folks (marketing/sales).