If you are really serious about being fair. Ask yourself this question: Why would a guy who can easily get 6K+ USD per month by working on Upwork, Toptal work for Gitlab for 1/3rd of that money and that too Full time?
Guys who are applying to Gitlab, make sure you checkout the compensation for your experience and geographic location https://about.gitlab.com/jobs/developer/#compensation . This may bite you in the later stages of the interview. If you look at the extremes, the salary you would get in Luanda, Angola is 1500% more than what you get if you were in Valenzuela, Philippines.
A quick google search will show you that people use 30% of their salary towards their rent: https://www.google.co.in/search?q=rent+as+percentage+of+sala... What does that tell you about computing salaries based off of rent?
You can see a lot of people discussing Gitlab's salary in a negative way on HN: https://hn.algolia.com/?query=gitlab%20salary&sort=byPopular... Most of them have fluff responses talking about being open and fair.