I currently live in a major city but have plans to move to a lower cost rural area. If I did that while I was working at Gitlab they would slash my salary and reap my cost saving, do you think I would be generating less value for them in exchange?
There are two answers to this. One is "No, but prices aren't determined by 'value'. Having air to breathe is very valuable, but it's free! You've got to consider supply as well as demand." The other is "Yes. Previously you were the most efficient source of code per dollar they could get (on the margin). Now you aren't."
